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

See also: frivolous

• dynamitist
• dynamize
• dynamo
• dynamometer
• Dynapen
• dynast
• dynastic
• dynasty
• dyne
• dysaphia
• dysarthria
• dyscalculia
• dyschezia
• dyscrasia
• Dysdercus
• dysentery
• dysfunction
• dysfunctional
• dysgenesis
• dysgenic
• dysgenics
• dysgraphia
• dyskinesia
• dyslectic
• dyslexia