If you describe someone as hot-headed, you are criticizing them for acting too quickly, without thinking of the consequences.
英英词典释义
Adjective
1. quickly aroused to anger;
"a hotheaded commander"
2. 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)