This morpheme tends to mean "to act in a way that is?". Some of the most representative words that include it are: kindly, decently, firmly. It's typically applied to adverbs.
See the full list below:
- only
- really
- probably
- actually
- particularly
- usually
- certainly
- especially
- simply
- clearly
- finally
- recently
- quickly
- generally
- nearly
- suddenly
- obviously
- exactly
- immediately
- easily
- highly
- eventually
- fully
- directly
- slightly
- hardly
- completely
- normally
- relatively
- apparently
- merely
- early
- slowly
- largely
- currently
- possibly
- mainly
- carefully
- previously
- entirely
- extremely
- fairly
- increasingly
- equally
- surely
- frequently
- totally
- absolutely
- necessarily
- partly
- seriously
- widely
- properly
- closely
- effectively
- unfortunately
- strongly
- rapidly
- similarly
- originally
- virtually
- perfectly
- badly
- significantly
- naturally
- rarely
- heavily
- occasionally
- quietly
- regularly
- firmly
- mostly
- initially
- gently
- shortly
- specifically
- subsequently
- essentially
- gradually
- deeply
- precisely
- successfully
- greatly
- respectively
- presumably
- briefly
- truly
- primarily
- basically
- definitely
- inevitably
- reasonably
- constantly
- considerably
- ultimately
- approximately
- secondly
- readily
- automatically
- deliberately
- newly
- personally
- surprisingly
- commonly
- purely
- sufficiently
- consequently
- potentially
- notably
- undoubtedly
- sharply
- roughly
- accordingly
- softly
- wholly
- barely
- formally
- namely
- typically
- thoroughly
- traditionally
- formerly
- mentally
- strictly
- physically
- literally
- specially
- correctly
- sadly
- lightly
- hopefully
- desperately
- locally
- officially
- separately
- severely
- simultaneously
- alternatively
- happily
- firstly
- substantially
- politically
- safely
- exclusively
- solely
- consistently
- tightly
- steadily
- fortunately
- broadly
- publicly
- scarcely
- freely
- invariably
- instantly
- differently
- dramatically
- socially
- actively
- remarkably
- rightly
- reportedly
- evidently
- accurately
- honestly
- genuinely
- independently
- daily
- practically
- importantly
- continually
- positively
- explicitly
- partially
- neatly
- repeatedly
- temporarily
- utterly
- predominantly
- beautifully
- permanently
- openly
- seemingly
- privately
- ideally
- comparatively
- swiftly
- terribly
- abruptly
- adequately
- legally
- jointly
- sincerely
- individually
- annually
- efficiently
- silently
- bitterly
- allegedly
- indirectly
- angrily
- incidentally
- technically
- sexually
- economically
- unusually
- loudly
- ironically
- strangely
- presently
- duly
- principally
- smoothly
- promptly
- frankly
- nicely
- supposedly
- reluctantly
- comfortably
- exceptionally
- extensively
- curiously
- appropriately
- continuously
- unexpectedly
- fundamentally
- financially
- kindly
- urgently
- fiercely
- lately
- conversely
- enormously
- hastily
- poorly
- historically
- distinctly
- thirdly
- incredibly
- preferably
- radically
- wildly
- progressively
- calmly
- systematically
- violently
- brightly
- vigorously
- chiefly
- plainly
- admittedly
- casually
- narrowly
- politely
- evenly
- faintly
- oddly
- suitably
- internationally
- interestingly
- secretly
- finely
- emotionally
- eagerly
- luckily
- freshly
- painfully
- markedly
- cautiously
- thoughtfully
- commercially
- nervously
- centrally
- wrongly
- immensely
- consciously
- mutually
- arguably
- loosely
- proudly
- conveniently
- environmentally
- anxiously
- profoundly
- mildly
- expressly
- internally
- instinctively
- critically
- universally
- visually
- furiously
- theoretically
- morally
- dangerously
- additionally
- warmly
- infinitely
- logically
- momentarily
- intensely
- cheerfully
- extraordinarily
- impatiently
- satisfactorily
- grimly
- likely
- implicitly
- collectively
- coldly
- accidentally
- uniquely
- confidently
- overwhelmingly
- brilliantly
- illegally
- unanimously
- wonderfully
- professionally
- indefinitely
- patiently
- thankfully
- understandably
- statistically
- vastly
- voluntarily
- notoriously
- vividly
- wearily
- unduly
- cheaply
- briskly
- willingly
- pleasantly
- unnecessarily
- spontaneously
- favourably
- generously
- enthusiastically
- sensibly
- paradoxically
- hurriedly
- marginally
- powerfully
- lastly
- usefully
- decidedly
- stiffly
- richly
- moderately
- inherently
- adversely
- drastically
- ostensibly
- hopelessly
- faithfully
- thinly
- helplessly
- characteristically
- acutely
- uncomfortably
- weakly
- vertically
- exceedingly
- frantically
- periodically
- intently
- routinely
- intimately
- coolly
- drily
- grossly
- variously
- excessively
- remotely
- visibly
- peacefully
- awfully
- thickly
- wisely
- endlessly
- jolly
- amazingly
- randomly
- superbly
- forcibly
- flatly
- gratefully
- awkwardly
- boldly
- suspiciously
- crucially
- harshly
- uneasily
- realistically
- culturally
- unsuccessfully
- hugely
- correspondingly
- unconsciously
- subtly
- securely
- passionately
- tentatively
- ordinarily
- dearly
- doubly
- predictably
- delicately
- genetically
- geographically
- strikingly
- wryly
- objectively
- noticeably
- steeply
- horribly
- massively
- clinically
- artificially
- prominently
- ruefully
- inadvertently
- intellectually
- bravely
- knowingly
- sweetly
- keenly
- superficially
- externally
- discreetly
- unfairly
- miserably
- gravely
- tremendously
- peculiarly
- informally
- convincingly
- unwittingly
- conventionally
- defiantly
- rigidly
- modestly
- uniformly
- decisively
- bluntly
- gladly
- blindly
- aggressively
- lovingly
- psychologically
- mysteriously
- sympathetically
- skilfully
- emphatically
- reliably
- solemnly
- experimentally
- smartly
- brutally
- prematurely
- resolutely
- unreasonably
- conceivably
- legitimately
- warily
- dimly
- relentlessly
- gaily
- incorrectly
- strategically
- darkly
- vitally
- cleverly
- irritably
- savagely
- horizontally
- idly
- mechanically
- overtly
- uncertainly
- inwardly
- intrinsically
- persistently
- squarely
- densely
- earnestly
- manually
- miraculously
- triumphantly
- admirably
- innocently
- popularly
- electronically
- noisily
- cruelly
- crossly
- elegantly
- aptly
- busily
- graphically
- selectively
- forcefully
- nominally
- rigorously
- disproportionately
- hotly
- crudely
- effortlessly
- intentionally
- ruthlessly
- infrequently
- mistakenly
- alternately
- rationally
- arbitrarily
- regrettably
- falsely
- blankly
- unhappily
- conspicuously
- scientifically
- solidly
- chemically
- tragically
- eminently
- lazily
- vehemently
- inextricably
- materially
- speedily
- unquestionably
- latterly
- inexorably
- involuntarily
- huskily
- habitually
- patently
- pointedly
- alarmingly
- gracefully
- stubbornly
- gingerly
- verbally
- blatantly
- justifiably
- carelessly
- astonishingly
- unequivocally
- affectionately
- structurally
- proportionately
- biologically
- intermittently
- belatedly
- tenderly
- inadequately
- gloomily
- empirically
- indignantly
- manifestly
- amply
- defensively
- justly
- ideologically
- spectacularly
- absently
- doubtfully
- sternly
- grudgingly
- mercifully
- wistfully
- comprehensively
- singly
- singularly
- liberally
- succinctly
- profitably
- expertly
- intuitively
- numerically
- constitutionally
- apologetically
- hesitantly
- impossibly
- ridiculously
- fondly
- meticulously
- heartily
- absurdly
- madly
- successively
- reputedly
- abundantly
- orally
- symbolically
- intensively
- unambiguously
- fatally
- foolishly
- concurrently
- supremely
- wholeheartedly
- spiritually
- attractively
- academically
- soundly
- breathlessly
- unilaterally
- fervently
- insufficiently
- overly
- electrically
- painstakingly
- unnaturally
- delightfully
- functionally
- recklessly
- mathematically
- sarcastically
- shyly
- dreadfully
- provisionally
- truthfully
- elaborately
- outwardly
- splendidly
- determinedly
- handsomely
- curtly
- passively
- unlawfully
- perpetually
- categorically
- conclusively
- sorely
- unbelievably
- qualitatively
- respectfully
- musically
- diagonally
- impressively
- restlessly
- democratically
- obediently
- lavishly
- merrily
- self-consciously
- retrospectively
- reassuringly
- scornfully
- meekly
- undeniably
- tactfully
- hoarsely
- ominously
- unmistakably
- shakily
- helpfully
- terminally
- militarily
- deftly
- chronically
- lawfully
- clumsily
- marvellously
- incredulously
- abnormally
- exquisitely
- medically
- magically
- viciously
- magnificently
- dismissively
- sparingly
- purposefully
- distantly
- surreptitiously
- intelligently
- constructively
- plausibly
- deceptively
- semantically
- stupidly
- contemptuously
- appreciably
- fourthly
- sparsely
- starkly
- precariously
- subconsciously
- irregularly
- classically
- cynically
- cleanly
- sourly
- obliquely
- irrevocably
- distinctively
- meaningfully
- wilfully
- fearfully
- summarily
- conceptually
- philosophically
- rudely
- indiscriminately
- guiltily
- energetically
- linguistically
- rhythmically
- scrupulously
- jealously
- feebly
- decently
- fractionally
- expectantly
- competitively
- humbly
- laterally
- fortnightly
- laboriously
- improperly
- encouragingly
- strenuously
- graciously
- approvingly
- coincidentally
- metaphorically
- inappropriately
- ecologically
- educationally
- imperfectly
- instantaneously
- inexplicably
- immaculately
- assiduously
- hungrily
- unofficially
- shrewdly
- uncontrollably
- sensitively
- negligently
- inversely
- unsteadily
- gloriously
- famously
- imperceptibly
- responsibly
- fleetingly
- gleefully
- grammatically
- blithely
- appreciatively
- dully
- spatially
- mercilessly
- sardonically
- contentedly
- purposely
- courteously
- tartly
- tersely
- mockingly
- unsurprisingly
- eternally
- perilously
- unconditionally
- bleakly
- unevenly
- startlingly
- brusquely
- wickedly
- unashamedly
- creatively
- doggedly
- dishonestly
- regretfully
- avidly
- globally
- lamely
- organically
- unfavourably
- deliciously
- anonymously
- eloquently
- embarrassingly
- aesthetically
- aimlessly
- demonstrably
- compulsorily
- impeccably
- disastrously
- blissfully
- unwillingly
- appallingly
- crisply
- diligently
- imaginatively
- fluently
- disturbingly
- immeasurably
- tastefully
- funnily
- unbearably
- attentively
- racially
- smugly
- roundly
- tirelessly
- conscientiously
- maliciously
- linearly
- disappointingly
- quantitatively
- technologically
- regionally
- perversely
- deservedly
- amiably
- refreshingly
- mightily
- unpleasantly
- menacingly
- greedily
- indecently
- irresistibly
- uncharacteristically
- blandly
- sleepily
- ably
- profusely
- sequentially
- sheepishly
- yearly
- expensively
- soothingly
- covertly
- domestically
- vainly
- wrongfully
- despairingly
- methodically
- incessantly
- accusingly
- pathetically
- playfully
- distally
- charmingly
- quarterly
- hysterically
- outstandingly
- grandly
- unobtrusively
- unaccountably
- quizzically
- bodily
- needlessly
- apprehensively
- soberly
- slyly
- persuasively
- admiringly
- dreamily
- seasonally
- alphabetically
- snugly
- frighteningly
- gruffly
- feverishly
- subjectively
- airily
- posthumously
- unacceptably
- cunningly
- nonchalantly
- proportionally
- romantically
- analytically
- erroneously
- administratively
- unkindly
- customarily
- glumly
- obligingly
- syntactically
- artistically
- unintentionally
- religiously
- chronologically
- woefully
- grotesquely
- haphazardly
- prudently
- humanly
- minutely
- exhaustively
- obsessively
- incongruously
- ludicrously
- obstinately
- impulsively
- unceremoniously
- amicably
- unjustly
- stoutly
- serenely
- competently
- steadfastly
- histologically
- excellently
- ethnically
- studiously
- uncritically
- endoscopically
- stylistically
- prettily
- stunningly
- outrageously
- unwisely
- validly
- memorably
- controversially
- icily
- hideously
- ferociously
- eerily
- diplomatically
- intravenously
- dismally
- joyfully
- dynamically
- pitifully
- reflectively
- criminally
- tidily
- loyally
- optimistically
- dryly
- weekly
- improbably
- coherently
- limply
- diametrically
- acidly
- identically
- protectively
- depressingly
- provocatively
- causally
- mischievously
- confusingly
- dubiously
- shamelessly
- questioningly
- definitively
- leisurely
- naively
- confidentially
- convulsively
- derisively
- threateningly
- jokingly
- devastatingly
- consecutively
- nightly
- preferentially
- frightfully
- sporadically
- erratically
- indifferently
- rightfully
- furtively
- flexibly
- healthily
- inordinately
- speculatively
- proximally
- inescapably
- unknowingly
- agreeably
- tactically
- architecturally
- tantalisingly
- languidly
- wordlessly
- ritually
- stealthily
- irretrievably
- remorselessly
- staunchly
- surgically
- beneficially
- painlessly
- reverently
- nobly
- resentfully
- candidly
- moodily
- mortally
Note: these words have been obtained from Wiktionary and have been classified and improved through automated computer linguistics processes.