incautious

Etymology

From in- (negative prefix) + cautious.

adj

  1. careless, reckless, not exercising proper caution.
    "Yes, let 'Sister' Davis have a whack at it too," urged George Bland. Tom Davis, who was Joe Matson's particular chum, was designated "Sister" because, in an incautious moment, when first coming to Excelsior Hall, he had shown a picture of his very pretty sister, Mabel. 1912, Stratemeyer Syndicate, chapter 1, in Baseball Joe on the School Nine

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