happy-go-lucky

blithely unconcerned

Synonyms: blithe, carefree, carefree and untroubled, casual, cheerful, content, cool, devil-may-care, easy, easygoing, feckless, free and easy, free-minded, heedless, improvident, insouciant, irresponsible, lackadaisical, lighthearted, living the life of Riley, nonchalant, reckless, unconcerned, untroubled, without care

Antonyms: disconsolate, discontented, dissatisfied, distressed, troubled, upset, worried

My father was a happy-go-lucky man whom nothing could discourage for long.