rashness

adjective

  1. marked by or proceeding from undue haste or lack of deliberation or caution

  2. quickly effective

a rash promise

adventurous venturesome daring daredevil rash reckless foolhardy mean exposing oneself to danger more than required by good sense. adventurous implies a willingness to accept risks but not necessarily imprudence. venturesome implies a jaunty eagerness for perilous undertakings.