Synonyms of happy-go-lucky

1 Syllable
cool
2 Syllables
blithe, cheerful, content, casual, heedless, easy, reckless, feckless
3 Syllables
hang-loose, outgiving, unworried, nonchalant, easygoing, relaxed, untroubled, lightsome, carefree, free-minded, insouciant, lighthearted, fancy-free
4 Syllables
improvident, devil-may-care, unconcerned
5 Syllables
irresponsible, lackadaisical