happy go lucky

/ˈhæpi ɡoʊ ˈlʌki/
adjective
  1. Cheerful and carefree, not worrying about the future or problems.
    • Even in difficult times, he remained happy-go-lucky and optimistic.
    • She has a happy-go-lucky attitude that makes her fun to be around.
    • My brother is a happy-go-lucky person who never stresses about anything.