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

See also: frivolous

• B-girl
• B-horizon
• b-meson
• B-scan ultrasonography
• B-side
• B. B. King
• B. F. Skinner
• B.O.
• B.Th.U.
• B2B
• B2C
• Ba
• baa
• baa-lamb
• Baader-Meinhof Gang
• Baal
• Baal Merodach
• baas
• baba
• baba au rhum
• babacu oil
• Babar
• babassu
• babassu nut
• babassu oil