lighthearted

having or showing freedom from worries or trouble <his lighthearted attitude in the face of danger was the source of some concern> Synonyms blithe, debonair, devil-may-care, gay, happy-go-lucky, insouciant, carefree, lightsome, slaphappy, unconcernedRelated Words blasé (also blase), breezy, cavalier, nonchalant; casual, easygoing, informal, laid-back, low-pressure, relaxed, unfussyNear Antonyms earnest, grave, serious, serious-minded, somber (or sombre); careful, cautious, heedful, wary; anxious, concerned, upset, worried; long-suffering, overburdened, sorrowfulAntonyms careworn