#1 impetuous s. [hotheaded, impulsive, madcap, tearaway, brainish] characterized by undue haste and lack of thought or deliberation; "a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"; ('brainish' is archaic). wn
#2 impetuous s. marked by violent force; "impetuous heaving waves". wn
vizzz