madcap

Noun
  1. A reckless impetuous irresponsible person (synset 110011068)
Adjective
  1. Characterized by undue haste and lack of thought or deliberation (synset 300327506)
    "a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"

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