lighthearted (adj.)

• airy
• blithe
• blithesome
• breezy
• buoyant
• carefree
• corky
• debonair
• effervescent
• expansive
• festive
• free
• gay
• glad
• gleeful
• happy
• high-spirited
• insouciant
• jaunty
• jocund
• jolly
• jovial
• joyful
• joyous
• light
• lightsome
• lively
• minded
• mirthful
• perky
• resilient
• spirited
• sprightly
• vivacious
• volatile