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

See also: frivolous

• monetarist
• monetary
• monetary fund
• monetary resource
• monetary standard
• monetary system
• monetary unit
• monetary value
• monetisation
• monetise
• monetization
• monetize
• money
• money belt
• money box
• money changer
• money cowrie
• money dealer
• money handler
• money laundering
• money market
• money order
• money plant
• money supply
• money-spinner