| industriously | (adverb) in an industrious manner | - |
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| ineffectively | (adverb) in an ineffective manner | Synonyms: inefficaciously |
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| ineffectually | (adverb) in an ineffectual manner | - |
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| inefficiently | (adverb) in an inefficient manner | - |
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| inelegantly | (adverb) without elegance | - |
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| ineloquently | (adverb) without eloquence; in an inarticulate manner | Synonyms: inarticulately |
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| ineluctably | (adverb) by necessity | Synonyms: inescapably, inevitably, unavoidably |
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| ineptly | (adverb) with ineptitude; in an incompetent manner | Synonyms: fecklessly |
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| (adverb) in a maladroit manner | - |
| inequitably | (adverb) in an inequitable manner | - |
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| inevitably | (adverb) in such a manner as could not be otherwise | Synonyms: necessarily, needs, of necessity |
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| (adverb) by necessity | Synonyms: ineluctably, inescapably, unavoidably |
| inexactly | (adverb) in an imprecise manner | Synonyms: imprecisely |
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| inexhaustibly | (adverb) with indefatigable energy | Synonyms: indefatigably, tirelessly |
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| inexpediently | (adverb) in an inexpedient manner | - |
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| inexpertly | (adverb) in a crude and unskilled manner | Synonyms: artlessly, crudely |
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| inextricably | (adverb) in an inextricable manner | - |
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| infectiously | (adverb) in a contagious manner | Synonyms: contagiously |
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| infelicitously | (adverb) in an infelicitous manner | - |
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| infinitely | (adverb) continuing forever without end | Synonyms: endlessly |
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| (adverb) without bounds | Synonyms: boundlessly, immeasurably |
| influentially | (adverb) exerting influence | - |
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| informatively | (adverb) in an informative manner | Synonyms: instructively |
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| infrequently | (adverb) not many times | - |
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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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| 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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| 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 | - |
| inopportunely | (adverb) at an inconvenient time | Synonyms: malapropos |
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| inordinately | (adverb) to a surprising degree | Synonyms: extraordinarily |
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| inquisitively | (adverb) with curiosity | Synonyms: curiously, interrogatively |
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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 |
| 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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| insensately | (adverb) in an insensate manner | - |
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| insensitively | (adverb) in an insensitive manner | - |
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| insignificantly | (adverb) not to a significant degree or amount | - |
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| (adverb) in an insignificant manner | - |
| insinuatingly | (adverb) in an insinuating manner | - |
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| insistently | (adverb) in an insistent manner | - |
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| insolently | (adverb) in an insolent manner | - |
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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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| 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 | - |
| 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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| inventively | (adverb) in an inventive manner | - |
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| inveterate | (adverb) in a habitual and longstanding manner | Synonyms: chronically |
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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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| irately | (adverb) in an irate manner | - |
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| irrationally | (adverb) in an irrational manner | - |
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| irrelevantly | (adverb) in an irrelevant manner | - |
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| irresistibly | (adverb) incapable of being resisted | Synonyms: overpoweringly, overwhelmingly |
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| irresolutely | (adverb) lacking determination or decisiveness | - |
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| irrespective | (adverb) in spite of everything; without regard to drawbacks | Synonyms: disregarding, disregardless, no matter, regardless |
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| irretrievably | (adverb) in an irretrievable manner | - |
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| irreverently | (adverb) without respect | - |
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| (adverb) in an irreverent manner | - |
| irritably | (adverb) in an irritable manner | - |
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| (adverb) in a petulant manner | Synonyms: pettishly, petulantly, testily |
| irritatingly | (adverb) in an irritating manner | - |
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| isotropically | (adverb) in an isotropic manner | - |
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| item | (adverb) (used when listing or enumerating items) also | - |
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| jauntily | (adverb) in a jaunty fashionable manner | - |
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