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

See also: frivolous

• apocentre
• apochromatic
• apocope
• apocrine
• apocrine gland
• Apocrypha
• apocryphal
• apocryphally
• Apocynaceae
• apocynaceous
• Apocynum
• Apocynum androsaemifolium
• Apocynum cannabinum
• Apocynum pumilum
• apodal
• apodeictic
• apodeme
• Apodemus
• Apodemus sylvaticus
• apodictic
• Apodidae
• apodiform bird
• Apodiformes
• apodise
• apodize