lighthearted

Etymology

From Middle English lyght hertyd, liȝt-hertid, from light (adjective) + herted, hertid (“having a disposition”, adjective) (equivalent to light + hearted), from the noun herte. See more at light, heart, -ed.

adj

1. Joyful, glad, taking pleasure in being alive; not depressed or sad.
   The lighthearted young lovers ran over the hills.
2. Enjoyably lacking of seriousness, not grave.
   His lighthearted banjo performance was appreciated because it relieved the tension in tight situations.