hotheaded

adjectives

quickly aroused to anger
"a hotheaded commander"
choleric, hot-tempered, hotheaded, irascible, quick-tempered, short-tempered
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)
brainish, hotheaded, impetuous, impulsive, madcap, tearaway