| invariably | (adverb) without variation or change, in every case | Synonyms: always, constantly |
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| inventively | (adverb) in an inventive manner | - |
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| inversely | (adverb) in an inverse or contrary manner | Synonyms: reciprocally |
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| inveterate | (adverb) in a habitual and longstanding manner | Synonyms: chronically |
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| invidiously | (adverb) in a manner arousing resentment | - |
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| invincibly | (adverb) in an invincible manner | - |
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| invisibly | (adverb) without being seen | - |
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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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