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OAT→cautious

cautious

Flag: gbEnglishOxford American Thesaurus
cautious
adjective
he's a very cautious driver:
careful, wary, aware, heedful, attentive, alert, watchful, vigilant, hypervigilant, circumspect, prudent, guarded, on one's guard, chary, mindful;
informal cagey.
▷antonyms incautious; reckless.