adj. 25B6; adjective
a blithe disregard for the rules : CASUAL, indifferent, unconcerned, unworried, untroubled, uncaring, careless, heedless, thoughtless; nonchalant, blasé.
(poetic/literary) his blithe, smiling face : HAPPY, cheerful, jolly, merry, joyful, joyous, blissful, ecstatic, euphoric, elated; poetic/literary blithesome; dated gay.
thoughtful, sad.