| impracticably | (adverb) to an impracticable degree | - |
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| imprecisely | (adverb) in an imprecise manner | Synonyms: inexactly |
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| impregnably | (adverb) in an impregnable manner | - |
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| impressively | (adverb) in an impressive manner | Synonyms: imposingly |
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| improbably | (adverb) not easy to believe | Synonyms: implausibly, incredibly, unbelievably |
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| impromptu | (adverb) without advance preparation | Synonyms: ad lib, ad libitum, spontaneously |
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| improperly | (adverb) in an improper way | - |
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| improvidently | (adverb) in an improvident manner | - |
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| imprudently | (adverb) in an imprudent manner | - |
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