| inside | (adverb) within a building | Synonyms: indoors |
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| (adverb) on the inside | Synonyms: within |
| (adverb) in reality | Synonyms: at bottom, at heart, deep down, in spite of appearance |
| (adverb) with respect to private feelings | Synonyms: inwardly |
| insidiously | (adverb) in a harmfully insidious manner | Synonyms: perniciously |
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| insignificantly | (adverb) not to a significant degree or amount | - |
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| (adverb) in an insignificant manner | - |
| insincerely | (adverb) without sincerity | - |
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| insinuatingly | (adverb) in an insinuating manner | - |
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| insipidly | (adverb) in an insipid manner | - |
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| insistently | (adverb) in an insistent manner | - |
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