C1 adjective /ˌhæpi ɡoʊ ˈlʌki/
happy-go-lucky
无忧无虑的,轻松的,无忧的
Meaning
cheerfully unconcerned about the future; carefree
Example
She has a happy-go-lucky attitude and never worries about tomorrow.
她有着无忧无虑的态度,从不担心明天。