(a.) Easy going; carefree; improvident\.

beaming blase blissful blithesome boon bright bright and sunny carefree careless casual cheerful cheery chirk chirpy chirrupy delighted detached elated eupeptic euphoric exalted exhilarated flushed gay genial glad gladsome gleeful glowing happy happy-go-lucky heedless high hopeful in good spirits in high spirits indifferent insouciant irrepressible jocund jolly jovial joyful joyous jubilant laughing light-hearted lighthearted lightsome merry mirthful of good cheer optimistic pleasant radiant riant rosy sanguine sanguineous smiling sparkling sunny uncaring unconcerned winsome