1. Lacking seriousness; given to frivolity
   - airheaded, dizzy, empty-headed, giddy, light-headed, lightheaded, silly

See also: frivolous

• light unit
• light up
• light upon
• light welterweight
• light whipping cream
• Light Within
• light-armed
• light-blue
• light-boned
• light-colored
• light-coloured
• light-duty
• light-emitting diode
• light-fingered
• light-footed
• light-green
• light-haired
• light-handed
• light-handedly
• light-headedly
• light-heartedly
• light-minded
• light-mindedness
• light-o'-love
• light-of-love