| incendiary | (adjective) involving deliberate burning of property | - |
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| (adjective) capable of catching fire spontaneously or causing fires or burning readily | - |
| (adjective) arousing to action or rebellion | Synonyms: incitive, inflammatory, instigative, rabble-rousing, seditious |
| incensed | (adjective) angered at something unjust or wrong | Synonyms: indignant, outraged, umbrageous |
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| inceptive | (adjective) in an initial stage | Synonyms: inchoative |
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| incertain | (adjective) lacking or indicating lack of confidence or assurance | Synonyms: uncertain, unsure |
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| incessant | (adjective) uninterrupted in time and indefinitely long continuing | Synonyms: ceaseless, constant, never-ending, perpetual, unceasing, unremitting |
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| incestuous | (adjective) relating to or involving incest | - |
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| (adjective) resembling incest as by excessive intimacy | - |