| 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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