slaphappy

/ˈslæpˌhæpi/
adjective
  1. Dizzy or silly from being hit or from exhaustion; giddy in a dazed way.
    • After staying up all night studying, she felt slaphappy and couldn't stop giggling.
    • The boxer was slaphappy after taking too many punches to the head.
    • We were so tired on the long drive that we became slaphappy and started telling ridiculous jokes.
  2. Cheerfully careless or irresponsible; recklessly happy.
    • His slaphappy attitude toward deadlines annoyed his manager.
    • They took a slaphappy approach to budgeting and soon ran out of money.
    • The slaphappy driver ignored the speed limit and nearly caused an accident.
Antonyms
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