| 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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