madcap

noun

a reckless impetuous irresponsible person
向こう見ずで衝動的で無責任な人

adjective

characterized by undue haste and lack of thought or deliberation
過度の急性と思案または熟考の不足によって特徴づけられる
- a hotheaded decision
  向こう見ずな決定
- liable to such impulsive acts as hugging strangers
  見知らぬ人に抱きつくといったような衝動行為をしがちである
- an impetuous display of spending and gambling
  消費と賭博を衝動的に見せること
- madcap escapades
  軽率な冒険

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