| inexplicably | (adverb) in a manner differing from the usual or expected | Synonyms: curiously, oddly, peculiarly |
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| inexpressibly | (adverb) to an inexpressible degree | Synonyms: indescribably, ineffably, unspeakably, unutterably |
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| inextricably | (adverb) in an inextricable manner | - |
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| inflexibly | (adverb) in an inflexible manner | - |
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| inhospitably | (adverb) in an inhospitable manner | - |
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| inimitably | (adverb) in an unreproducible manner | Synonyms: unreproducibly |
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| insatiably | (adverb) in an insatiable manner; with persistence but without satisfaction | Synonyms: unsatiably |
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| (adverb) to an insatiable degree | Synonyms: unsatiably |
| inscrutably | (adverb) in an inscrutable manner | - |
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| insensibly | (adverb) in a numb manner; without feeling | Synonyms: numbly |
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| inseparably | (adverb) without possibility of separation | - |
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| insubstantially | (adverb) not substantially; lacking substantial expression or fullness | Synonyms: impalpably |
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| insufferably | (adverb) in an extremely arrogant or conceited manner | - |
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| (adverb) to an insufferable degree | Synonyms: unsufferably |
| insuperably | (adverb) to an insuperable degree | - |
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| intelligibly | (adverb) in an intelligible manner | Synonyms: clearly, understandably |
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| interchangeably | (adverb) in an interchangeable manner | - |
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| interminably | (adverb) all the time; seemingly without stopping | Synonyms: endlessly |
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| intolerably | (adverb) to an unacceptable degree | Synonyms: unacceptably |
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| intractably | (adverb) in an intractable manner | - |
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| invariably | (adverb) without variation or change, in every case | Synonyms: always, constantly |
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| invincibly | (adverb) in an invincible manner | - |
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| invisibly | (adverb) without being seen | - |
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| irreparably | (adverb) in an irreparable manner or to an irreparable degree | - |
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| irreproachably | (adverb) in an irreproachable and blameless manner | Synonyms: blamelessly |
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| irresistibly | (adverb) incapable of being resisted | Synonyms: overpoweringly, overwhelmingly |
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| irresponsibly | (adverb) in an irresponsible manner | - |
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| irretrievably | (adverb) in an irretrievable manner | - |
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| irreversibly | (adverb) in an irreversible manner | - |
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| irrevocably | (adverb) in an irrevocable manner | - |
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| irritably | (adverb) in an irritable manner | - |
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| (adverb) in a petulant manner | Synonyms: pettishly, petulantly, testily |
| jubilantly | (adverb) in a joyous manner | Synonyms: blithely, gayly, happily, merrily, mirthfully |
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| justifiably | (adverb) with good reason | - |
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| laboriously | (adverb) in a laborious manner | - |
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| lamentably | (adverb) in an unfortunate or deplorable manner | Synonyms: deplorably, sadly, woefully |
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| laudably | (adverb) in an admirable manner | Synonyms: admirably, commendable, praiseworthily |
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| laughably | (adverb) so as to arouse or deserve laughter | Synonyms: ludicrously, preposterously, ridiculously |
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| legibly | (adverb) in a legible manner | Synonyms: decipherably, readably |
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| liberally | (adverb) freely in a nonliteral manner | - |
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| (adverb) in a generous manner | Synonyms: generously, munificently |
| lugubriously | (adverb) in a sorrowful lugubrious manner | - |
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| manageably | (adverb) so as to be manageable | - |
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| maybe | (adverb) by chance | Synonyms: mayhap, peradventure, perchance, perhaps, possibly |
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| measurably | (adverb) to a measurable degree | - |
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| memorably | (adverb) in a memorable manner | Synonyms: unforgettably |
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| metabolically | (adverb) involving metabolism | - |
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| miserably | (adverb) in a miserable manner | - |
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| monosyllabically | (adverb) in a monosyllabic manner | - |
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| morbidly | (adverb) in a morbid manner or to a morbid degree | - |
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| nearby | (adverb) not far away in relative terms | - |
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| nebulously | (adverb) in a nebulous and indefinite manner | - |
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| neurobiological | (adverb) with respect to neurobiology | - |
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| nimbly | (adverb) in a nimble or agile manner; with quickness and lightness and ease | Synonyms: agilely |
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| nobly | (adverb) in a noble manner | - |
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| nonverbally | (adverb) without words | Synonyms: non-verbally |
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| notably | (adverb) especially; in particular | - |
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| (adverb) to a remarkable degree or extent | Synonyms: remarkably, unco, unusually |
| noticeably | (adverb) in a noticeable manner | Synonyms: observably, perceptibly |
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| numbly | (adverb) in a numb manner; without feeling | Synonyms: insensibly |
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| obdurately | (adverb) in a stubborn unregenerate manner | Synonyms: cussedly, mulishly, obstinately, pig-headedly, stubbornly |
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| obediently | (adverb) in an obedient manner | Synonyms: yieldingly |
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| objectionably | (adverb) in an obnoxious manner | Synonyms: obnoxiously, offensively |
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| objectively | (adverb) with objectivity | - |
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| obligatorily | (adverb) in a manner that cannot be evaded | Synonyms: compulsorily, mandatorily |
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| (adverb) in an obligatory manner | - |
| obligingly | (adverb) in accommodation | Synonyms: accommodatingly |
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| obliquely | (adverb) at an oblique angle | Synonyms: aslant, athwart |
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| (adverb) to, toward or at one side | Synonyms: sidelong, sideways |
| obnoxiously | (adverb) in an obnoxious manner | Synonyms: objectionably, offensively |
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| obscenely | (adverb) in a lewd and obscene manner | Synonyms: lewdly |
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| (adverb) to an obscene degree | - |
| obscurely | (adverb) in an obscure manner | - |
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| obsequiously | (adverb) in an obsequious manner | Synonyms: servilely, subserviently |
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| observably | (adverb) in a noticeable manner | Synonyms: noticeably, perceptibly |
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| observantly | (adverb) in an observant manner | Synonyms: observingly |
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| observingly | (adverb) in an observant manner | Synonyms: observantly |
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| obsessionally | (adverb) in a compulsive manner | Synonyms: compulsively, obsessively |
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| obsessively | (adverb) in a compulsive manner | Synonyms: compulsively, obsessionally |
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| obstinately | (adverb) in a stubborn unregenerate manner | Synonyms: cussedly, mulishly, obdurately, pig-headedly, stubbornly |
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| obstreperously | (adverb) in manner that attracts attention | Synonyms: clamorously, loudly |
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| obstructively | (adverb) in an obstructive manner | Synonyms: hinderingly |
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| obtrusively | (adverb) in an obtrusive manner | - |
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| obtusely | (adverb) stupidly or insensitively | Synonyms: densely, dumbly |
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| obviously | (adverb) unmistakably (`plain' is often used informally for `plainly') | Synonyms: apparently, evidently, manifestly, patently, plain, plainly |
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| ostensibly | (adverb) from appearances alone | Synonyms: apparently, on the face of it, seemingly |
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| overbearingly | (adverb) in an overbearing manner | - |
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| overboard | (adverb) from on board a vessel into the water | - |
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| (adverb) to extremes | - |
| palatably | (adverb) in a palatable way | - |
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| palpably | (adverb) so as to be palpable | - |
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| pardonably | (adverb) in an excusable manner or to an excusable degree | Synonyms: excusably, forgivably |
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| passably | (adverb) to certain extent or degree | Synonyms: fairly, jolly, middling, moderately, pretty, reasonably, somewhat |
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| peaceably | (adverb) in a peaceable manner | Synonyms: pacifically |
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| perceptibly | (adverb) in a noticeable manner | Synonyms: noticeably, observably |
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| permissibly | (adverb) in a permissible manner | Synonyms: allowably |
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| pickaback | (adverb) on the back or shoulder or astraddle on the hip | Synonyms: pig-a-back, piggyback |
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| (adverb) on a railroad flatcar | Synonyms: pig-a-back, piggyback |
| piggyback | (adverb) on the back or shoulder or astraddle on the hip | Synonyms: pickaback, pig-a-back |
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| (adverb) on a railroad flatcar | Synonyms: pickaback, pig-a-back |
| pitiably | (adverb) in a manner arousing sympathy and compassion | Synonyms: pathetically |
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| plausibly | (adverb) easy to believe on the basis of available evidence | Synonyms: believably, credibly, probably |
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| pleasurably | (adverb) in a very pleasurable manner | Synonyms: deliciously |
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| plumb | (adverb) conforming to the direction of a plumb line | - |
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| (adverb) exactly | Synonyms: plum |
| (adverb) completely; used as intensifiers | Synonyms: clean, plum |
| polysyllabically | (adverb) in a polysyllabic manner | - |
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| possibly | (adverb) by chance | Synonyms: maybe, mayhap, peradventure, perchance, perhaps |
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| (adverb) to a degree possible of achievement or by possible means | - |
| practicably | (adverb) in a practicable manner; so as to be feasible | Synonyms: feasibly |
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| predictably | (adverb) in a predictable manner or to a predictable degree | - |
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| preferably | (adverb) more readily or willingly | Synonyms: rather, sooner |
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| presentably | (adverb) in a presentable manner | - |
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| presumably | (adverb) by reasonable assumption | Synonyms: presumptively |
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