tearaway (
http://definr.com/tearaway)
adj : 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) [syn:
hotheaded,
impulsive,
impetuous,
madcap,
tearaway(a),
brainish]
n : (British) a reckless and impetuous person