What is the synonym and antonym of cautious? Antonyms: careless, drowsy, dull, heedless, inattentive, incautious, inconsiderate, neglectful, negligent, oblivious, thoughtless, unwary. Synonyms: alert, awake, careful, circumspect, on the alert, on the lookout, sleepless, vigilant, wakeful, wary, ...
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