light-hearted

adj (a) without cares; cheerful 无忧无虑的; 轻松愉快的. (b) (derog 贬) not serious or sensible enough; casual 漫不经心的; 随便的.

lifelike, lifeline, lifelong, lifer, lifestyle, lifetime, lift, lift-attendant, lift-off, ligament, ligature, light, light bulb, light industry, light meter, light pen, light up, light-coloured, light-fingered, light-headed, light-heartedly, light-heartedness, light-heavyweight, light-sensitive, light-year, lighten, lighter, lighterage, lighterman, lighthearted, lighthouse, lighting, lightly, lightness, lightning, lightning conductor, lightning strike, lightning-bug, lightship, lightweight,