Adjectives with 18 letters (819)



  • counter-productive
  • gastro-oesophageal
  • neurophysiological
  • middle-of-the-road
  • non-denominational
  • pathophysiological
  • anti-establishment
  • neuropsychological
  • self-contradictory
  • once-in-a-lifetime
  • immunohistological
  • immunocytochemical
  • post-translational
  • spur-of-the-moment
  • surface-to-surface
  • interparliamentary
  • anti-revolutionary
  • biostratigraphical
  • quantum-mechanical
  • attention-grabbing
  • non-stoichiometric
  • electroluminescent
  • spectrophotometric
  • honest-to-goodness
  • catch-as-catch-can
  • pancreaticobiliary
  • immunopathological
  • psychopathological
  • microenvironmental
  • cerebroventricular
  • colour-coordinated
  • non-administrative
  • supradiaphragmatic
  • lymphoplasmacytoid
  • psychoneurological
  • verisimilitudinous
  • bioelectromagnetic
  • interinstitutional
  • hyperproliferative
  • no-questions-asked
  • intracytoplasmatic
  • adenocarcinomatous
  • finite-dimensional
  • antidiscriminatory
  • electrotherapeutic
  • ethnomusicological
  • extraparliamentary
  • autophosphorylated
  • self-extinguishing
  • palaeoceanographic
  • self-justificatory
  • psychobiographical
  • neurodevelopmental
  • counterpropagating
  • neurotoxicological
  • palaeogeographical
  • electrophysiologic
  • technobureaucratic
  • angioimmunoblastic
  • biobibliographical
  • dimercaptosuccinic
  • palaeolimnological
  • pseudoisochromatic
  • anti-devolutionist
  • microdensitometric
  • cyclopropannulated
  • anthropobiological
  • glycoproteinaceous
  • divertissementlike
  • lymphohematogenous
  • back to square one
  • nanoelectroablated
  • naked as a jaybird
  • down on one's luck
  • extramitochondrial
  • ultranationalistic
  • antipredestinarian
  • brand spanking new
  • phytomorphological
  • radiorespirometric
  • heterofermentative
  • somaticosplanchnic
  • parallelogrammatic
  • extramorphological
  • immunoenzymometric
  • normal for Norfolk
  • subparaventricular
  • hypochondroplastic
  • thin on the ground
  • faciodigitogenital
  • nonsadomasochistic
  • palaeopathological
  • moisture-repellent
  • electrobasographic
  • eleven-dimensional
  • parallelogrammical
  • thermopathological
  • microstratigraphic
  • moisture-resistant
  • pseudocomplemented
  • supergravitational
  • fibrocartilagenous
  • supersophisticated
  • electrobiochemical
  • hispanomedievalist
  • fibrocartilaginous
  • nanoelectrosprayed
  • pseudorhombohedral
  • nonsuperconducting
  • intercommunicative
  • picocyanobacterial
  • underaccommodative
  • sociopsychological
  • panbiogeographical
  • hyperpermeabilized
  • photophysiological
  • psychomanipulative
  • chondrodystrophoid
  • equidistributional
  • geomicrobiological
  • Proto-Indo-Iranian
  • sympathoexcitatory
  • immunofluorimetric
  • station to station
  • heptatriacontanoic
  • dumb as a doornail
  • photopiezoelectric
  • immunofluorometric
  • Kinnaird compliant
  • noncommunicational
  • sympathoinhibitory
  • anti-globalisation
  • methemoglobinaemic
  • counterinformative
  • untransliteratable
  • dumber than a rock
  • ceratobasidiaceous
  • intercompartmental
  • parapharmaceutical
  • noncontainerizable
  • paleobiogeographic
  • phototypographical
  • ureteropyeloscopic
  • pseudolongitudinal
  • blepharonasofacial
  • dendrohydrological
  • osteoimmunological
  • slippery as an eel
  • nonhistoriographic
  • nonmusculoskeletal
  • anthropogeographic
  • nonultrastructural
  • hypocomplementemic
  • thermophotovoltaic
  • agammaglobulinemic
  • mechanotherapeutic
  • physicotheological
  • metatranscriptomic
  • hyperphosphataemic
  • transmitochondrial
  • noncontemporaneous
  • orthokeratological
  • centrodiapophyseal
  • erythromyelogenous
  • silent as the tomb
  • mechanotransducive
  • phosphorothiolated
  • photochronographic
  • soaked to the bone
  • down to a fine art
  • phaeosphaeriaceous
  • sonospectrographic
  • gravity brightened
  • magnetohydrostatic
  • chronophotographic
  • soaked to the skin
  • bronchospasmolytic
  • photopolymerizable
  • tubulointerstitial
  • aminostratigraphic
  • chondromesenchymal
  • metaconstitutional
  • antifibromatogenic
  • antitransportation
  • agro-environmental
  • zosterophyllaceous
  • microgravitational
  • physio-therapeutic
  • pseudomathematical
  • quasithermodynamic
  • electrotelegraphic
  • antidiscrimination
  • in all one's glory
  • unconceptualizable
  • pyroelectrodynamic
  • tetratriacontanoic
  • thermalgravimetric
  • antidiscriminative
  • sensori-volitional
  • autophagolysosomal
  • dermatofibromatous
  • Northwest Germanic
  • cyclostratigraphic
  • anthropolinguistic
  • micromorphological
  • pentatriacontanoic
  • neuropsychodynamic
  • hypophosphorylated
  • kakorrhaphiophobic
  • nonchromatographic
  • gone with the wind
  • corystospermaceous
  • pushing up daisies
  • photogravitational
  • in at the deep end
  • like a dog in heat
  • aequihymeniiferous
  • hepatocarcinogenic
  • palmately compound
  • circumnavigational
  • heredodegenerative
  • antistaphylococcal
  • musculoaponeurotic
  • geranylgeranylated
  • octadecatetraenoic
  • zygomaticoalveolar
  • antistaphylococcic
  • introspectionistic
  • cytodifferentiated
  • non-weight-bearing
  • lagenocanaliculate
  • subdifferentiating
  • grammaticosemantic
  • coccidioidomycotic
  • higher than a kite
  • microtechnological
  • Ukrainian-Canadian
  • neuroimmunological
  • osteomorphological
  • electrotransferred
  • dead on one's feet
  • quantum mechanical
  • multiobservational
  • musculoligamentous
  • zygomaticosphenoid
  • electrotransformed
  • immunoinflammatory
  • socked on the nose
  • nonentrepreneurial
  • palaeovegetational
  • zygomaticotemporal
  • pseudodifferential
  • quartzofeldspathic
  • photoheterotrophic
  • cercidiphyllaceous
  • ultrarevolutionary
  • countertherapeutic
  • spondyloepiphyseal
  • noncinematographic
  • single-lens reflex
  • steady-as-she-goes
  • fibroproliferative
  • oesophagobronchial
  • cancelled to order
  • mesometeorological
  • seroepizootiologic
  • salpingopharyngeal
  • anthropomorphistic
  • microheterogeneous
  • antipsychoanalytic
  • extraphilosophical
  • postbronchodilator
  • noncircumferential
  • green at the gills
  • cathodoluminescent
  • hypermaterialistic
  • intercostobrachial
  • endocytobiological
  • tough as old boots
  • intercartilaginous
  • protopsychological
  • interphotoreceptor
  • anticonstitutional
  • pretransplantation
  • tibiotalocalcaneal
  • inside-the-Beltway
  • magnetoquasistatic
  • countertrafficking
  • gerontotherapeutic
  • anticonstructivism
  • ethnophilosophical
  • cycloheptannulated
  • pseudodiverticular
  • noninfrastructural
  • tetrakaidekahedral
  • countertransferent
  • culturo-scientific
  • astrophotometrical
  • vesicovaginorectal
  • paleoenvironmental
  • hyperglobulinaemic
  • selfcongratulatory
  • neuroarchitectural
  • viscoelastoplastic
  • cryphonectriaceous
  • strongly connected
  • glossopteridaceous
  • enterohaemorrhagic
  • stereolithographic
  • pancreaticosplenic
  • enantiocontrolling
  • metalloproteolytic
  • cybertechnological
  • leptosphaeriaceous
  • hyperglutamatergic
  • magnetorheological
  • nonepistemological
  • xenotransplantable
  • electrocontractile
  • property-theoretic
  • vasculoneuropathic
  • agrometeorological
  • enantiodetermining
  • nonbioaccumulative
  • odontotremataceous
  • opsonophagocytotic
  • histoarchitectural
  • labyrinthectomised
  • ethnopsychological
  • labyrinthectomized
  • hot from the press
  • physiopathological
  • postimplementation
  • fresh off the boat
  • multiquasiparticle
  • anisohypermetropic
  • to the manner born
  • climatotherapeutic
  • transitive animate
  • neuroleptanalgesic
  • vesiculoulcerative
  • retinohypothalamic
  • metallotherapeutic
  • pharmacoeconomical
  • immunoluminometric
  • open and affirming
  • twopenny-halfpenny
  • hepatopathological
  • nematohydrodynamic
  • biopharmacological
  • astragalocalcaneal
  • nonequidimensional
  • stubborn as a mule
  • radiotoxicological
  • calm as a millpond
  • teledermatological
  • videodermoscopical
  • Norwegian-Canadian
  • radioimmunological
  • subdolichocephalic
  • amphisphaeriaceous
  • honest to goodness
  • osseocartilaginous
  • astroseismological
  • pseudomythological
  • nonstereoselective
  • scissors-and-paste
  • poststratification
  • crystallographical
  • acousticopalpebral
  • psychoprophylactic
  • nonjustificational
  • ichnomorphological
  • plethysmographical
  • oestroprogestative
  • paedopsychological
  • pepsinhydrochloric
  • in Dickie's meadow
  • cerebellomedullary
  • intrapsychological
  • osteoradionecrotic
  • pseudoneuropterous
  • microtransactional
  • myeloarchitectonic
  • not going anywhere
  • nonmicrobiological
  • hypofibrinogenemic
  • cineradiographical
  • myeloarchitectural
  • calcaneoastragalar
  • characteriological
  • chromolithographic
  • ecoepidemiological
  • tall in the saddle
  • cool as a cucumber
  • ultrasonographical
  • full of one's self
  • stereophotographic
  • pharmacoinformatic
  • polypharmaceutical
  • choledochoduodenal
  • born to the purple
  • hypergravitational
  • over and done with
  • polyfunctionalised
  • biophysicochemical
  • pentafluorobenzoic
  • micropaleontologic
  • psychosociological
  • green in the gills
  • magnetotherapeutic
  • ultrasophisticated
  • transtrophectoderm
  • multicompartmental
  • polyfunctionalized
  • noncardiopulmonary
  • quick off the mark
  • histoimmunological
  • biophysiographical
  • calcareobituminous
  • palaeoclimatologic
  • antivaccinationist
  • politicohistorical
  • supraphysiological
  • over head and ears
  • chemoarchitectonic
  • metschnikowiaceous
  • hymenopterological
  • chemoarchitectural
  • postpericardiotomy
  • nonpsychotomimetic
  • electrodiffusional
  • semitranscendental
  • nonretroreflective
  • anticounterfeiting
  • antiecclesiastical
  • pharmacomechanical
  • pseudoorthorhombic
  • dodecadodecahedral
  • arteriolosclerotic
  • supertechnological
  • heterobifunctional
  • palaeoconservative
  • exoribonucleolytic
  • macroenvironmental
  • multiconfiguration
  • stephanoberyciform
  • superferromagnetic
  • thermoviscoelastic
  • photodisintegrated
  • semiphlogisticated
  • cheirolepidiaceous
  • antihyperglycaemic
  • phonocardiographic
  • underchoreographed
  • slow on the uptake
  • chock-a-block full
  • microiontophoretic
  • immuno-compromised
  • semiphosphorescent
  • cryptobasidiaceous
  • antiserotoninergic
  • kiss up, kick down
  • nonpharmacological
  • opisthomonorchiine
  • double-plus-ungood
  • swords and sorcery
  • dysfibrinogenaemic
  • histomorphological
  • pharmacopathogenic
  • supercomputational
  • glaucomatocyclitic
  • linearly dependent
  • postinterventional
  • neurocomputational
  • rotten to the core
  • on good terms with
  • antihyperlipidemic
  • esophagopharyngeal
  • isoconfigurational
  • prodifferentiative
  • intrainstitutional
  • chromophotographic
  • fucked in the head
  • nonatherosclerotic
  • semihallucinogenic
  • arterioventricular
  • neurotechnological
  • antiphosphorylated
  • microseismological
  • cerebrohepatorenal
  • polygamomonoecious
  • pseudopathological
  • massively parallel
  • cholescintigraphic
  • Pennsylvania Dutch
  • hypernationalistic
  • thermodilatometric
  • cheap and cheerful
  • immunophenotypical
  • noninsurrectionary
  • a long time coming
  • consequentialistic
  • hydrogravitational
  • polychromatophilic
  • cardiopathological
  • cervicomediastinal
  • postpolymerization
  • normophosphataemic
  • subcontemporaneous
  • cheap like borscht
  • monofunctionalised
  • pseudoverticillate
  • bioelectrochemical
  • noncounterbalanced
  • undepartmentalized
  • postcommissurotomy
  • normoprolactinemic
  • duodecimarticulate
  • elastohydrodynamic
  • metametalinguistic
  • monofunctionalized
  • myeloproliferative
  • no questions asked
  • extracytoplasmatic
  • neurocysticercotic
  • nonsociolinguistic
  • thought-controlled
  • mercaptoundecanoic
  • merry as a cricket
  • performance-driven
  • immunopotentiating
  • chemoheterotrophic
  • antiradicalization
  • computationalistic
  • phosphometabolomic
  • preantepenultimate
  • spectroastrometric
  • glomerulonephritic
  • representationless
  • arctometatarsalian
  • immunoprecipitable
  • pyrophosphorolytic
  • antimedicalization
  • pseudoanaphylactic
  • atherothrombogenic
  • proatherosclerotic
  • pseudogovernmental
  • hexaphosphorylated
  • chamaesiphonaceous
  • epiphenomenalistic
  • photospectrometric
  • colour coordinated
  • pre-decimalisation
  • scleroconjunctival
  • antivivisectionist
  • immunoprecipitated
  • pre-decimalization
  • psychodermatologic
  • nonphosphorylating
  • brachybasidiaceous
  • macroglobulinaemic
  • rostrodorsolateral
  • peptostreptococcal
  • ass over teakettle
  • bioanthropological
  • pustulocrustaceous
  • glomerulosclerotic
  • dull as ditchwater
  • microvitreoretinal
  • pseudophotographic
  • intracartilaginous
  • achlorophyllaceous
  • happy as a sandboy
  • microlepidopterous
  • sclerodermataceous
  • nonparameterizable
  • nontransplantation
  • interhemispherical
  • number-theoretical
  • capsuloligamentous
  • hypertechnological
  • noninterchangeable
  • lepidopterological
  • photoelectroactive
  • counterdistinctive
  • norepinephrinergic
  • rostroventromedial
  • immunoprophylactic
  • unbefuckinlievable
  • angiocardiographic
  • socioenvironmental
  • elastoviscoplastic
  • aminochronological
  • vehicularly housed
  • nonphotorefractive
  • interdissepimental
  • Middle High German
  • astrochronological
  • Sherlock Holmesish
  • postconstitutional
  • microconglomeratic
  • aurally challenged
  • countereducational
  • paleopalynological
  • costodiaphragmatic
  • nitro-hydrochloric
  • lophiostomataceous
  • photoelectromotive
  • Constantinopolitan
  • Archie Bunkeresque
  • multiculturalistic
  • pseudobiographical
  • nonconfrontational
  • nonparasitological
  • antiglucocorticoid
  • immunocolorimetric
  • biopsychospiritual
  • prothoracicotropic
  • batrachomyomachian
  • phosphonopentanoic
  • antireductionistic
  • autoethnographical
  • otoneuroprotective
  • historico-cultural
  • clinicodemographic
  • cosmochronological
  • holoprosencephalic
  • chemoorganotrophic
  • anarcha-feministic
  • methaemoglobinuric
  • capitulotubercular
  • pseudopornographic
  • lasiosphaeriaceous
  • interneurofilament
  • intramitochondrial
  • hydrostratigraphic
  • microphysiological
  • arthrodermataceous
  • paleophysiological
  • microarchitectural
  • polymorph-perverse
  • homofunctionalized
  • Indiana Jonesesque
  • deconstructivistic
  • regressive leftist
  • osteoarcheological
  • palaeohistological
  • electrogravimetric
  • middle of the road
  • positive recurrent
  • noncentrosymmetric
  • fire and brimstone
  • neuroembryological
  • light as a feather
  • karyomorphological
  • nonelectrochemical
  • palaeohydrological
  • hexatetracontanoic
  • too clever by half
  • tuberoinfundibular
  • myco-heterotrophic
  • psychogeographical
  • spectromicroscopic
  • gastro-œsophageal
  • lactoovovegetarian
  • reality challenged
  • electropolymerized
  • precontemporaneous
  • heterodifunctional
  • Equatorial Guinean
  • forward compatible
  • noncerebrovascular
  • reverse-pickpocket
  • palaeoichnological
  • antirehabilitation
  • corticosubcortical
  • cyclopentannulated
  • nonelectrophoretic
  • rhombitrihexagonal
  • polymorphocellular
  • pseudoprofessional
  • nonparthenogenetic
  • phanerocrystalline
  • pharyngoepiglottic
  • inconceptualizable
  • pseudohypertrophic
  • decontextualizable
  • microspectroscopic
  • pharyngoesophageal
  • same gender loving
  • polymorphonucleate
  • glycolylneuraminic
  • par for the course
  • extrainstitutional
  • asialotriantennary
  • spoiled for choice
  • osteocartilaginous
  • morphophonological
  • quasimonochromatic
  • ultramicrochemical
  • cyberphilosophical
  • quasimonoenergetic
  • postadministration
  • lactose intolerant
  • good as one's word
  • interzygapophyseal
  • passive-aggressive
  • chronoamperometric
  • countably additive
  • unphiloprogenitive
  • trimethylsilylated
  • astroglaciological
  • countably infinite
  • nonparticularistic
  • electrokymographic
  • loculoascomycetous
  • hyperthyroxinaemic
  • anarcho-capitalist
  • trans-exclusionary
  • buzzword compliant
  • eyeball to eyeball
  • autosplenectomized
  • unintellectualized
  • old enough to vote
  • thoracolumbosacral
  • prenationalization
  • paleoseismological
  • lithostratigraphic
  • magnetocentrifugal
  • Proto-Afro-Asiatic
  • antiadministration
  • photoferroelectric
  • ultramicroscopical
  • pseudointellectual
  • same-gender-loving
  • nonlexicographical
  • helioseismological
  • all skin and bones
  • ventriculoarterial
  • ahead in the count
  • hung like a donkey
  • argilloferruginous
  • ustilaginomycetous
  • pseudoquantitative
  • deubiquitinylating
  • good enough to eat
  • telemeteorographic
  • paleospinothalamic
  • antilatitudinarian
  • prehospitalization
  • sound on the goose
  • nowhere to be seen
  • pallidosubthalamic
  • out of one's depth
  • magnetochronologic
  • cystourethroscopic
  • nondistinguishable
  • diastereoselective
  • superphysiological
  • osteoclastogenetic
  • mutually exclusive
  • neurophilosophical
  • pathomorphological
  • constitutionalised
  • electrorheological
  • antibronchospastic
  • nonanthropological
  • hematopathological
  • palaeolongitudinal
  • intersubstitutable
  • hypercholesteremic
  • transglycosylating
  • hyperprolactinemic
  • photofluorographic
  • nonanthropomorphic
  • dead as a doorknob
  • quasiperpendicular
  • dead as a doornail
  • proud as a peacock
  • magnetocrystalline
  • hyperproliferating
  • antiosteoarthritic
  • tracheooesophageal
  • dead as a mackerel
  • fibrinosuppurative
  • cyberpsychological
  • nonanticholinergic
  • pseudojournalistic
  • bronchioloalveolar
  • out of one's skull
  • hydrometallurgical
  • equicharacteristic
  • phototopographical
  • superdeterministic
  • transdiaphragmatic
  • constitutionalized
  • mad as a cut snake
  • monophosphorylated
  • bright as a button
  • clean as a whistle
  • palaeoneurological
  • periinterventional
  • nonheteronormative
  • granulocytopoietic
  • down for the count
  • drunk as a fiddler
  • hippocampocortical
  • comme ci comme ça
  • infradiaphragmatic
  • deaf as a doorpost
  • nonprocrastinating
  • mechanoluminescent
  • pathopsychological
  • nonexhibitionistic
  • macromorphological
  • transmicrovascular
  • nonantipseudomonal
  • noninvestigational

Note: these words have been obtained from Wiktionary and have been classified and improved through automated computer linguistics processes.

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