1650s, from in- (1) "not" + cautious (adj.). The Latin adjective was incautus. Related: Incautiously. Incaution (n.) is attested from 1715.
incautious talk
an incautious remark
an incautious step sent her headlong down the stairs
incarceration
incarnadine
incarnate
incarnation
incase
incautious
incendiarism
incendiary
incensation
incense
incensed
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