A hothead is someone who's suddenly and easily angered or agitated. It's usually a hothead who starts a riot or turns a peaceful protest violent.

A friend who seems calm one minute and furious the next is a hothead — and if you've ever witnessed a "road rage" incident involving an unreasonably angry driver, you know how unpredictable a hothead can be. This useful noun has been around since the 17th century, influenced by the Old English equivalent, hatheort or "hot heart," and Elizabethan English's hot-brain.

Definitions of hothead
  1. noun
    a reckless impetuous irresponsible person
    synonyms: daredevil, harum-scarum, lunatic, madcap, swashbuckler
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    a reckless and impetuous person
    type of:
    adventurer, venturer
    a person who enjoys taking risks
  2. noun
    a belligerent grouch
    synonyms: fire-eater
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    type of:
    churl, crank, crosspatch, grouch, grump
    a bad-tempered person
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