hothead
Concise Oxford English Dictionary © 2008 Oxford University Press:
hothead/ˈhɒthed/
▶noun an impetuous or quick-tempered person.
– derivatives
hot-headed adjective,
hot-headedly adverb,
hot-headedness noun.
hot-headed adjective,
hot-headedly adverb,
hot-headedness noun.
'hothead' also found in these Oxford entries:

