| infrequently | (adverb) not many times | - |
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| ingeniously | (adverb) in an ingenious manner | - |
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| ingenuously | (adverb) in an ingenuous manner | Synonyms: artlessly |
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| ingloriously | (adverb) in a dishonorable manner or to a dishonorable degree | Synonyms: discreditably, disgracefully, dishonorably, dishonourably, ignominiously, shamefully |
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| ingratiatingly | (adverb) in a flattering and ingratiating manner | - |
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| inherently | (adverb) in an inherent manner | - |
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| inhospitably | (adverb) in an inhospitable manner | - |
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| inhumanely | (adverb) in an inhumane manner | - |
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| inimitably | (adverb) in an unreproducible manner | Synonyms: unreproducibly |
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| iniquitously | (adverb) in an iniquitous manner | - |
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| initially | (adverb) at the beginning | Synonyms: ab initio, at first |
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| injudiciously | (adverb) in an injudicious manner | - |
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| injuriously | (adverb) in an injurious manner | - |
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| inland | (adverb) towards or into the interior of a region | - |
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| innately | (adverb) in an innate manner | - |
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| innocently | (adverb) in a naively innocent manner | - |
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| (adverb) in a not unlawful manner | - |
| inoffensively | (adverb) in a not unpleasantly offensive manner | - |
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| inopportunely | (adverb) at an inconvenient time | Synonyms: malapropos |
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| inordinately | (adverb) to a surprising degree | Synonyms: extraordinarily |
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| inorganically | (adverb) not involving carbon compounds | - |
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| inquiringly | (adverb) in an inquiring manner | Synonyms: enquiringly |
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| inquisitively | (adverb) with curiosity | Synonyms: curiously, interrogatively |
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| insanely | (adverb) in an insane manner | Synonyms: crazily, dementedly, madly |
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| (adverb) (used as intensives) excessively | Synonyms: deadly, deucedly, devilishly, madly |
| insatiably | (adverb) in an insatiable manner; with persistence but without satisfaction | Synonyms: unsatiably |
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| (adverb) to an insatiable degree | Synonyms: unsatiably |
| inscriptively | (adverb) by means of an inscription | - |
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| inscrutably | (adverb) in an inscrutable manner | - |
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| insecticidally | (adverb) by means of an insecticide | - |
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| insecurely | (adverb) in a manner involving risk | - |
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| (adverb) in a tentative and self-conscious manner | - |
| insensately | (adverb) in an insensate manner | - |
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| insensibly | (adverb) in a numb manner; without feeling | Synonyms: numbly |
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| insensitively | (adverb) in an insensitive manner | - |
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| inseparably | (adverb) without possibility of separation | - |
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| inshore | (adverb) toward the shore | - |
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| inside | (adverb) within a building | Synonyms: indoors |
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| (adverb) on the inside | Synonyms: within |
| (adverb) in reality | Synonyms: at bottom, at heart, deep down, in spite of appearance |
| (adverb) with respect to private feelings | Synonyms: inwardly |
| insidiously | (adverb) in a harmfully insidious manner | Synonyms: perniciously |
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| insignificantly | (adverb) not to a significant degree or amount | - |
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| (adverb) in an insignificant manner | - |
| insincerely | (adverb) without sincerity | - |
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| insinuatingly | (adverb) in an insinuating manner | - |
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| insipidly | (adverb) in an insipid manner | - |
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| insistently | (adverb) in an insistent manner | - |
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| insofar | (adverb) to the degree or extent that | Synonyms: in so far, so far, to that degree, to that extent |
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| insolently | (adverb) in an insolent manner | - |
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| insomuch | (adverb) to such an extent or degree; so | - |
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| inspirationally | (adverb) with inspiration; in an inspiring manner | - |
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| instantaneously | (adverb) without any delay | Synonyms: in a flash, instantly, outright |
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| instantly | (adverb) without delay or hesitation; with no time intervening | Synonyms: at once, directly, forthwith, immediately, like a shot, now, right away, straight off, straightaway |
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| (adverb) without any delay | Synonyms: in a flash, instantaneously, outright |
| instead | (adverb) in place of, or as an alternative to | Synonyms: alternatively, or else |
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| (adverb) on the contrary | Synonyms: rather |
| instinctively | (adverb) as a matter of instinct | - |
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| institutionally | (adverb) by an institution | - |
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| instructively | (adverb) in an informative manner | Synonyms: informatively |
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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 |
| insufficiently | (adverb) to an insufficient degree | - |
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| insultingly | (adverb) in an unfair and insulting manner | Synonyms: foully |
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| (adverb) in a disrespectful and insulting manner | - |
| insuperably | (adverb) to an insuperable degree | - |
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| integrally | (adverb) in an integral manner | - |
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| intellectually | (adverb) of or relating to the intellect | - |
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| intelligently | (adverb) in an intelligent manner | - |
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| intelligibly | (adverb) in an intelligible manner | Synonyms: clearly, understandably |
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| intemperately | (adverb) indulging excessively | Synonyms: hard, heavily |
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| intensely | (adverb) to a high degree; extremely; in high concentration or density | - |
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| (adverb) to a great depth psychologically or emotionally | Synonyms: deeply, profoundly |
| intensively | (adverb) in an intensive manner | - |
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| intentionally | (adverb) with intention; in an intentional manner | Synonyms: advisedly, by choice, by design, deliberately, designedly, on purpose, purposely |
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| intently | (adverb) with strained or eager attention | - |
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| interchangeably | (adverb) in an interchangeable manner | - |
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| interdepartmental | (adverb) between departments | - |
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| interestingly | (adverb) in an interesting manner | - |
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| intermediately | (adverb) to an intermediate degree | - |
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| interminably | (adverb) all the time; seemingly without stopping | Synonyms: endlessly |
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| intermittently | (adverb) in an intermittent manner | - |
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| internally | (adverb) on or from the inside | - |
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| internationally | (adverb) worldwide | Synonyms: globally |
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| interracially | (adverb) by race | - |
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| interrogatively | (adverb) with curiosity | Synonyms: curiously, inquisitively |
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| (adverb) in a questioning format | - |
| intimately | (adverb) in a close manner | Synonyms: closely, nearly |
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| (adverb) with great or especially intimate knowledge | Synonyms: well |
| intolerably | (adverb) to an unacceptable degree | Synonyms: unacceptably |
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| intolerantly | (adverb) in a manner that isn't broad-minded | Synonyms: illiberally |
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| (adverb) in an intolerant manner | - |
| intractably | (adverb) in an intractable manner | - |
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| intradermally | (adverb) into the skin | - |
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| intramuscularly | (adverb) in an intramuscular way | - |
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| intransitively | (adverb) in an intransitive manner | - |
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| intravenously | (adverb) in an intravenous manner | - |
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| intrepidly | (adverb) without fear | Synonyms: dauntlessly, fearlessly |
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| intricately | (adverb) with elaboration | Synonyms: elaborately, in an elaborate way |
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| intrinsically | (adverb) with respect to its inherent nature | Synonyms: in and of itself, per se |
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| intuitively | (adverb) in an intuitive manner | - |
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| invariably | (adverb) without variation or change, in every case | Synonyms: always, constantly |
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| inventively | (adverb) in an inventive manner | - |
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| inversely | (adverb) in an inverse or contrary manner | Synonyms: reciprocally |
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| inveterate | (adverb) in a habitual and longstanding manner | Synonyms: chronically |
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| invidiously | (adverb) in a manner arousing resentment | - |
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| invincibly | (adverb) in an invincible manner | - |
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| invisibly | (adverb) without being seen | - |
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| invitingly | (adverb) in a tantalizing manner | Synonyms: tantalizingly |
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| involuntarily | (adverb) against one's will or done without conscious thought | - |
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| inward | (adverb) toward the center or interior | Synonyms: inwards |
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| (adverb) to or toward the inside of | Synonyms: in, inwards |
| inwardly | (adverb) with respect to private feelings | Synonyms: inside |
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| inwards | (adverb) toward the center or interior | Synonyms: inward |
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| (adverb) to or toward the inside of | Synonyms: in, inward |