| 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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