adjective [blie-th]

FULL DEFINITION

-of a happy lighthearted character or disposition

or

-lacking due thought or consideration

-casual, heedless

SYNONYMS: cheerful, blithesome, bright, buoyant, canty [British dialect], cheery, chipper, eupeptic, gay, gladsome, lightsome, sunny, upbeat, winsome

ANTONYMS: dour, gloomy, glum, morose, saturnine, sulky, sullen