← BackshareGuesslighthearted/ˈlaɪtˌhɑrtɪd/adjectiveCheerful and carefree; not serious or worried.His lighthearted jokes helped ease the tension in the room.She gave a lighthearted wave as she left the party.The movie had a lighthearted tone that made everyone laugh.SynonymscheerfulcarefreeplayfulAntonymssolemnserious