| incalculable | (adjective) not able to be computed or enumerated | - |
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| (adjective) too much to be measured | Synonyms: untold |
| incandescent | (adjective) characterized by ardent emotion or intensity or brilliance | - |
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| (adjective) emitting light as a result of being heated | Synonyms: candent |
| incapable | (adjective) (followed by `of') lacking capacity or ability | - |
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| (adjective) (followed by `of') not having the temperament or inclination for | - |
| (adjective) not meeting requirements | Synonyms: incompetent, unequal to |
| (adjective) not being susceptible to or admitting of something (usually followed by `of') | - |
| incapacitated | (adjective) lacking in or deprived of strength or power | Synonyms: helpless |
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| incapacitating | (adjective) that cripples or disables or incapacitates | Synonyms: crippling, disabling |
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| incarnate | (adjective) invested with a bodily form especially of a human body | - |
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| (adjective) possessing or existing in bodily form | Synonyms: bodied, corporal, corporate, embodied |
| incased | (adjective) covered or protected with or as if with a case | Synonyms: cased, encased |
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| incautious | (adjective) lacking in caution | - |
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| (adjective) carelessly failing to exercise proper caution | - |