Lacking or showing a lack of due concern.

Carefree and happy and lighthearted:
— Was loved for her blithe spirit.
— A merry blithesome nature.

synonyms: blithesome, light-hearted, lighthearted, lightsome.

Roget 836: cheerful; happy etc. 827; cheery, cheerly^†; of good cheer, smiling; blithe; in spirits, in good spirits; breezy, bully, chipper [U.S.]; in high spirits, in high feather; happy as the day is long, happy as a king; gay as a lark; allegro; debonair; light, lightsome, light hearted; buoyant, debonnaire, bright, free and easy, airy; janty^†, jaunty, canty^†; hedonic^†; riant^†; sprightly, sprightful^†; spry; spirited, spiritful^†; lively, animated, vivacious; brisk as a bee; sparkling, sportive; full of play, full of spirit; all alive.    sunny, palmy; hopeful etc. 858.    merry as a cricket, merry as a grig^†, merry as a marriage bell; joyful, joyous, jocund, jovial; jolly as a thrush, jolly as a sandboy^†; blithesome; gleeful, gleesome^†; hilarious, rattling.    winsome, bonny, hearty, buxom.    playful, playsome^†; folatre [Fr.], playful as a kitten, tricksy^†, frisky, frolicsome; gamesome; jocose, jocular, waggish; mirth loving, laughter-loving; mirthful, rollicking.    elate, elated; exulting, jubilant, flushed; rejoicing etc. 838; cock-a-hoop.    cheering, inspiriting, exhilarating; cardiac, cardiacal^†; pleasing etc. 829; palmy.    ... show more