| infectiously | (adverb) in a contagious manner | Synonyms: contagiously |
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| infelicitously | (adverb) in an infelicitous manner | - |
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| infernally | (adverb) diabolically | Synonyms: hellishly |
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| infinitely | (adverb) continuing forever without end | Synonyms: endlessly |
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| (adverb) without bounds | Synonyms: boundlessly, immeasurably |
| inflexibly | (adverb) in an inflexible manner | - |
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| influentially | (adverb) exerting influence | - |
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| informally | (adverb) without formality | - |
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| (adverb) with the use of colloquial expressions | Synonyms: colloquially, conversationally |
| informatively | (adverb) in an informative manner | Synonyms: instructively |
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| infra | (adverb) (in writing) at a later place | Synonyms: below |
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| infrequently | (adverb) not many times | - |
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| inoffensively | (adverb) in a not unpleasantly offensive manner | - |
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| insignificantly | (adverb) not to a significant degree or amount | - |
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| (adverb) in an insignificant manner | - |
| insofar | (adverb) to the degree or extent that | Synonyms: in so far, so far, to that degree, to that extent |
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| insufferably | (adverb) in an extremely arrogant or conceited manner | - |
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| (adverb) to an insufferable degree | Synonyms: unsufferably |
| insufficiently | (adverb) to an insufficient degree | - |
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| joyfully | (adverb) in a joyous and gleeful manner | Synonyms: gleefully, joyously |
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| justifiably | (adverb) with good reason | - |
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| justifiedly | (adverb) with honesty | Synonyms: justly, rightly |
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| lawfully | (adverb) by law; conforming to the law | Synonyms: de jure, legally |
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| (adverb) in a manner acceptable to common custom | Synonyms: legitimately, licitly |
| left | (adverb) toward or on the left; also used figuratively | - |
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| lief | (adverb) with pleasure | Synonyms: fain, gladly |
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| lifelessly | (adverb) as if dead | Synonyms: deadly |
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| (adverb) without animation or vitality | - |
| (adverb) in a lifeless manner | - |
| loftily | (adverb) in a lofty manner | - |
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| lustfully | (adverb) in a lustful manner | - |
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| magnificently | (adverb) wonderfully | Synonyms: excellently, famously, splendidly |
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| (adverb) in an impressively beautiful manner | Synonyms: gorgeously, resplendently, splendidly |
| manfully | (adverb) in a manful manner; with qualities thought to befit a man | Synonyms: manly |
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| manifestly | (adverb) unmistakably (`plain' is often used informally for `plainly') | Synonyms: apparently, evidently, obviously, patently, plain, plainly |
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| masterfully | (adverb) in a skillfully masterful manner; with the skill of a master | - |
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| meaningfully | (adverb) in a meaningful manner; so as to be meaningful | - |
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| mercifully | (adverb) in a compassionate manner | - |
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| millionfold | (adverb) by a factor of a million | Synonyms: a million times |
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| mindfully | (adverb) in a careful deliberate manner | Synonyms: advertently, heedfully |
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| mirthfully | (adverb) in a joyous manner | Synonyms: blithely, gayly, happily, jubilantly, merrily |
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| mistrustfully | (adverb) with distrust | Synonyms: distrustfully |
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| mournfully | (adverb) in a mournful manner | - |
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| multifariously | (adverb) in diverse ways | Synonyms: diversely, variously |
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| munificently | (adverb) in a generous manner | Synonyms: generously, liberally |
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| needfully | (adverb) in an essential manner | Synonyms: necessarily |
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| nefariously | (adverb) in a nefarious manner or to a nefarious degree | - |
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| neglectfully | (adverb) in a neglectful manner | - |
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| ninefold | (adverb) by a factor of nine | Synonyms: nine times |
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| nonspecifically | (adverb) without specificity | - |
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| off | (adverb) at a distance in space or time | Synonyms: away |
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| (adverb) from a particular thing or place or position (`forth' is obsolete) | Synonyms: away, forth |
| (adverb) no longer on or in contact or attached | - |
| offensively | (adverb) aggressively | - |
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| (adverb) in an obnoxious manner | Synonyms: objectionably, obnoxiously |
| (adverb) in an unpleasantly offensive manner | - |
| offhand | (adverb) in a casually inconsiderate manner | Synonyms: offhanded, offhandedly |
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| (adverb) without previous thought or preparation | Synonyms: offhanded, offhandedly |
| offhanded | (adverb) in a casually inconsiderate manner | Synonyms: offhand, offhandedly |
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| (adverb) without previous thought or preparation | Synonyms: offhand, offhandedly |
| offhandedly | (adverb) in a casually inconsiderate manner | Synonyms: offhand, offhanded |
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| (adverb) without previous thought or preparation | Synonyms: offhand, offhanded |
| officially | (adverb) in an official role | - |
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| (adverb) with official authorization | Synonyms: formally |
| officiously | (adverb) in an officious manner | - |
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| offshore | (adverb) away from shore; away from land | - |
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| offside | (adverb) illegally in advance of the ball or puck | - |
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| offstage | (adverb) behind the scenes; not on stage | - |
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| (adverb) not in public | - |
| oft | (adverb) many times at short intervals | Synonyms: frequently, often, oftentimes, ofttimes |
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| often | (adverb) many times at short intervals | Synonyms: frequently, oft, oftentimes, ofttimes |
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| (adverb) frequently or in great quantities | Synonyms: a great deal, much |
| (adverb) in many cases or instances | - |
| oftener | (adverb) more often or more frequently | - |
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| oftentimes | (adverb) many times at short intervals | Synonyms: frequently, oft, often, ofttimes |
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| ofttimes | (adverb) many times at short intervals | Synonyms: frequently, oft, often, oftentimes |
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| overleaf | (adverb) on or to the other side of a page | - |
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| pacifically | (adverb) in a peaceable manner | Synonyms: peaceably |
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| pacifistically | (adverb) in a pacifistic manner | - |
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| painfully | (adverb) unpleasantly | Synonyms: distressingly |
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| (adverb) in or as if in pain | Synonyms: sorely |
| peacefully | (adverb) in a peaceful manner | - |
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| perfectly | (adverb) completely and without qualification; used informally as intensifiers | Synonyms: absolutely, dead, utterly |
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| (adverb) in a perfect or faultless way | - |
| perfidiously | (adverb) in a perfidious manner | - |
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| perforce | (adverb) by necessity; by force of circumstance | - |
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| perfunctorily | (adverb) in a set manner without serious attention; as a formality | Synonyms: pro forma |
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| pitifully | (adverb) to a pitiful degree | - |
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| playfully | (adverb) in a playful manner | - |
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| plentifully | (adverb) in a bountiful manner | Synonyms: bounteously, bountifully, plenteously |
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| powerful | (adverb) (Southern regional intensive) very; to a great degree | Synonyms: mightily, mighty, right |
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| powerfully | (adverb) in a manner having a powerful influence | Synonyms: potently |
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| (adverb) in a powerful manner | Synonyms: strongly |
| preferably | (adverb) more readily or willingly | Synonyms: rather, sooner |
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| preferentially | (adverb) in a preferential manner | - |
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| profanely | (adverb) in an irreverent or profane manner | - |
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| (adverb) with curses | - |
| professedly | (adverb) with pretense or intention to deceive | - |
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| (adverb) by open declaration | Synonyms: avowedly |
| professionally | (adverb) in a professional manner | - |
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| professorially | (adverb) in a professorial manner | - |
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| proficiently | (adverb) in a proficient manner | - |
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| profitably | (adverb) in a productive way | Synonyms: fruitfully, productively |
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| profitlessly | (adverb) without gain or profit | Synonyms: gainlessly, unprofitably |
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| profligately | (adverb) in a dissolute way | Synonyms: dissolutely |
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| profoundly | (adverb) to a great depth psychologically or emotionally | Synonyms: deeply, intensely |
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| profusely | (adverb) in an abundant manner | Synonyms: abundantly, copiously, extravagantly |
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| purposefully | (adverb) in a purposeful manner | - |
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| raffishly | (adverb) in a rakish manner | Synonyms: carelessly, rakishly |
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| reflectively | (adverb) in a reflective manner | - |
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| reflexively | (adverb) in a reflexive manner; by means of reflexes | Synonyms: reflexly |
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| reflexly | (adverb) in a reflexive manner; by means of reflexes | Synonyms: reflexively |
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| refreshfully | (adverb) in a manner that relieves fatigue and restores vitality | Synonyms: refreshingly |
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| refreshingly | (adverb) in a pleasantly novel manner | - |
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| (adverb) in a manner that relieves fatigue and restores vitality | Synonyms: refreshfully |
| regretfully | (adverb) with regret (used in polite formulas) | - |
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| remorsefully | (adverb) in a rueful manner | Synonyms: contritely, ruefully |
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| reproachfully | (adverb) in a reproving or reproachful manner | Synonyms: reprovingly |
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| resentfully | (adverb) with resentment; in a resentful manner | - |
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| resourcefully | (adverb) in a resourceful manner | - |
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| respectfully | (adverb) in a respectful manner | - |
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| restfully | (adverb) in a restful manner | Synonyms: quietly |
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| revengefully | (adverb) in a vindictive, revengeful manner | Synonyms: vengefully, vindictively |
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| rightfully | (adverb) by right | Synonyms: truly |
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| ruefully | (adverb) in a rueful manner | Synonyms: contritely, remorsefully |
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