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OET→happy-go-lucky

happy-go-lucky

Flag: gbEnglishOxford English Thesaurus
happy-go-lucky
adjective
their casual, happy-go-lucky manner:
easy-going, carefree, casual, free and easy, devil-may-care, blithe, nonchalant, insouciant, blasé, unconcerned, untroubled, unworried, light-hearted;
heedless, reckless, irresponsible, improvident;
informal slap-happy, laid-back.
▷antonyms anxious; serious.
happy-go-lucky Oxford Dictionary of English