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

See also: frivolous

• neurohormone
• neurohypophysis
• neurolemma
• neuroleptic
• neuroleptic agent
• neuroleptic drug
• neurolinguist
• gas fitting
• gas fixture
• gas furnace
• gas gage
• gas gangrene
• gas gauge
• gas giant
• gas gun
• gas guzzler
• gas heat
• gas heater
• gas helmet
• gas holder
• gas jet
• gas lamp
• gas line
• gas main
• gas maser