slaphappy

Adjective

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

• cheerfully irresponsible
  • carefree with his money
    
  • freewheeling urban youths
    
  • had a harum-scarum youth
    

Related words

• Synonyms: 
  punch-drunk , silly , carefree , devil-may-care , freewheeling , happy-go-lucky , harum-scarum