1. 性急的人：hotfoot 恶作剧 | hothead 性急的人 | hotheaded 性急的

2. 热塞柴油机：hotbox 过热轴承箱 | hothead 热塞柴油机 | hothouse 温室

3. 急性子的人,鲁莽的：swear-word 诅咒,骂人的话 | hothead 急性子的人,鲁莽的 | funereal 适于葬礼的,忧郁的

1. 头脑容易发热的人;鲁莽的人;急性子
If you refer to someone as a hothead, you are criticizing them for acting too quickly, without thinking of the consequences.

e.g. He is a hothead and a bully just like his dad.
他和他爸爸一样都是个恃强凌弱的莽夫。

noun

1. a reckless impetuous irresponsible person

Synonym: daredevilmadcapswashbucklerlunaticharum-scarum

2. a belligerent grouch

Synonym: fire-eater