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

See also: frivolous

• shirk
• shirker
• shirking
• Shirley Temple
• Shirley Temple Black
• Shirodkar's operation
• shirr
• shirred egg
• shirring
• shirt
• shirt button
• shirtdress
• shirtfront
• shirting
• shirtless
• shirtlifter
• shirtmaker
• shirtsleeve
• shirtsleeves
• shirttail
• shirtwaist
• shirtwaister
• shirty
• shish kebab
• shisha