| inside | (adjective) relating to or being on the side closer to the center or within a defined space | - |
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| (adjective) confined to an exclusive group | Synonyms: inner, privileged |
| (adjective) away from the outer edge | - |
| (adjective) being or applying to the inside of a building | - |
| insidious | (adjective) intended to entrap | - |
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| (adjective) working or spreading in a hidden and usually injurious way | Synonyms: pernicious, subtle |
| (adjective) beguiling but harmful | - |
| insightful | (adjective) exhibiting insight or clear and deep perception | - |
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| insignificant | (adjective) devoid of importance, meaning, or force | Synonyms: unimportant |
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| (adjective) signifying nothing | - |
| (adjective) of little importance or influence or power; of minor status | Synonyms: peanut |
| (adjective) small and unimpressive | Synonyms: dinky |
| insincere | (adjective) lacking sincerity | - |
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| insinuating | (adjective) calculated to please or gain favor | Synonyms: ingratiating, ingratiatory |
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| insipid | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, flavourless, savorless, savourless, vapid |
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| (adjective) lacking interest or significance or impact | Synonyms: jejune |
| insistent | (adjective) repetitive and persistent | Synonyms: repetitive |
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| (adjective) demanding attention | Synonyms: clamant, crying, exigent, instant |