madcap

• n. a reckless impetuous irresponsible person

  同义词： daredevil hothead swashbuckler lunatic harum-scarum

• adj. characterized by undue haste and lack of thought or deliberation

  "madcap escapades"

  同义词： hotheaded impulsive impetuous tearaway(a) brainish

以上来源于: WordNet