impetuous impetuous /ˌɪmˈpɛtʃwəs/

adjective

1. () Characterized by undue haste and lack of thought or deliberation  ( brainish [Archaic] , hotheaded , impulsive , impetuous , madcap , tearaway )
   characterized by undue haste and lack of thought or deliberation
    A hotheaded decision
   a hotheaded decision
    Liable to such impulsive acts as hugging strangers
   liable to such impulsive acts as hugging strangers
    An impetuous display of spending and gambling
   an impetuous display of spending and gambling
    Madcap escapades
   madcap escapades
   
2. Marked by violent force  ( impetuous )
   marked by violent force
    Impetuous heaving waves
   impetuous heaving waves