Adjective lighthearted, untroubled
Synonyms: airy, at ease, blithe, breezy, buoyant, calm, careless, cheerful, cheery, cool, easy, easy-going, feelgood, happy, happy-go-lucky, insouciant, jaunty, jovial, laid back, radiant, secure, sunny, unanxious, unbothered
Antonyms: anxious, heavyhearted, troubled, worried