| intolerable | (adjective) incapable of being tolerated or endured | Synonyms: unbearable, unendurable |
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| intolerant | (adjective) unwilling to tolerate difference of opinion | - |
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| (adjective) narrow-minded about cherished opinions | Synonyms: illiberal |
| intoned | (adjective) uttered in a monotonous cadence or rhythm as in chanting | Synonyms: chantlike, singsong |
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| intoxicant | (adjective) causing intoxication | Synonyms: intoxicating |
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| intoxicated | (adjective) stupefied or excited by a chemical substance (especially alcohol) | Synonyms: drunk, gone, inebriated, ripped |
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| (adjective) as if under the influence of alcohol | Synonyms: drunk |
| intoxicating | (adjective) causing intoxication | Synonyms: intoxicant |
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| (adjective) extremely exciting as if by alcohol or a narcotic | Synonyms: heady |