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

See also: frivolous

• arteriovenous
• arteritis
• artery
• artery of the labyrinth
• artery of the penis bulb
• artery of the vestibule bulb
• artesian
• artesian well
• artful
• artfully
• artfulness
• arthralgia
• arthralgic
• arthritic
• arthritis
• arthro-
• arthrocentesis
• arthrodesis
• arthrogram
• arthrography
• arthromere
• arthromeric
• arthropathy
• arthroplasty
• arthropod