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, tearaway(a), brainish]
n : a reckless impetuous irresponsible person [syn: daredevil, hothead, swashbuckler, lunatic, harum-scarum]