incautious
[adjective]
Synonyms: unalert, unguarded, unvigilant, unwary, unwatchful, rash, brash, hasty, hotheaded, ill-advised, inconsiderate, mad-brained, madcap, reckless, thoughtless, irresponsible, carefree, careless, feckless, uncareful, wild

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Antonyms: cautious
Contrasted words: careful, circumspect, judicious, wary, watchful, discreet, prudent, sensible, thoughtful, wise
Related Idioms: caught napping, off one's guard
Related Words: imprudent, indiscreet, injudicious, bold, brash, impetuous, rash, reckless, neglectful, negligent, regardless, thoughtless, unmindful, hasty

[TahlilGaran] English Synonym Dictionary ▲

in‧cau‧tious /ɪnˈkɔːʃəs $ -ˈkɒː-/ adjective
if you are incautious, you do not think about the possible bad results of your actions:
incautious remarks
The wine had made her incautious.
—incautiously adverb

[TahlilGaran] Dictionary of Contemporary English ▲