insolent | (adjective) marked by casual disrespect | Synonyms: flip, impudent, snotty-nosed |
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(adjective) unrestrained by convention or propriety | Synonyms: audacious, bald-faced, barefaced, bodacious, brassy, brazen-faced, brazen |
insoluble | (adjective) (of a substance) incapable of being dissolved | Synonyms: indissoluble |
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(adjective) admitting of no solution or explanation | - |
(adjective) without hope of solution | - |
insolvable | (adjective) not easily solved | Synonyms: unresolvable, unsoluble, unsolvable |
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insolvent | (adjective) unable to meet or discharge financial obligations | - |
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insomniac | (adjective) experiencing or accompanied by sleeplessness | Synonyms: sleepless, watchful |
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insouciant | (adjective) marked by blithe unconcern | Synonyms: casual, nonchalant |
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