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

See also: frivolous

• keratodermia
• keratohyalin
• keratoiritis
• keratomalacia
• keratomycosis
• keratonosis
• keratonosus
• keratoplasty
• keratoscleritis
• keratoscope
• keratoscopy
• keratosis
• keratosis blennorrhagica
• keratosis follicularis
• keratosis nigricans
• keratosis pilaris
• keratotomy
• kerb
• kerb crawler
• kerb crawling
• Kerbala
• Kerbela
• kerbside
• kerbstone
• kerchief