C1 adjective /ˌhæpi ɡoʊ ˈlʌki/
happy-go-lucky
insouciant, détendu, sans souci
Meaning
cheerfully unconcerned about the future; carefree
Example
She has a happy-go-lucky attitude and never worries about tomorrow.
Elle a une attitude heureuse et insouciante et ne se soucie jamais de demain.