DictionarymaniacWildly reckless person
noun

maniac

MAY-nee-ak/mˈeɪniˌæk/

A person behaving with wild or dangerous intensity.

That driver races through the neighborhood like a maniac.

A wildly reckless driver mounts a sidewalk at speed, grinning as a pedestrian jumps away and drops her groceries.
Etymology

Greek maniakos described someone affected with madness. The English adjective became a noun for such a person, with the broader use applying that image to someone wildly reckless or obsessive.

In context

Tudoriferous Podcast12:54
Chze is a maniac who wants to kill everybody. >> Everybody. Yes. >> You are not safe if you are in the same room as this man.
Early Renaissance Popes with Bry and Fry of Pontifacts

More examples

  • A maniac on a motorcycle nearly hits us.
  • She works like a maniac to meet the deadline.
  • Those maniacs set off fireworks inside the garage.

Forms

maniac · maniacs

maniacal adjective — Marked by wild or uncontrolled intensity.

Similar words

daredevil
A daredevil deliberately seeks danger, often for excitement or display.
hothead
A hothead acts rashly from anger rather than general wildness.