silly

Adjective

• dazed from or as if from repeated blows
  • knocked silly by the impact
    
  • slaphappy with exhaustion
    

• inspiring scornful pity
  • how silly an ardent and unsuccessful wooer can be especially if he is getting on in years- Dashiell Hammett
    

• lacking seriousness; given to frivolity
  • a dizzy blonde
    
  • light-headed teenagers
    
  • silly giggles
    

• ludicrous, foolish
  • gave me a cockamamie reason for not going
    
  • wore a goofy hat
    
  • a silly idea
    
  • some wacky plan for selling more books
    

Noun

• a word used for misbehaving children
  • don't be a silly
    

Related words

• Synonyms: 
  punch-drunk , slaphappy , pathetic , ridiculous , airheaded , dizzy , empty-headed , featherbrained , giddy , light-headed , lightheaded , cockamamie , cockamamy , goofy , sappy , wacky , whacky , zany