Adjective
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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)
-
quickly aroused to anger
"a hotheaded commander"
- hot tempered - quick tempered - short tempered