Definition of maniac in English:

maniac

Syllabification: ma·ni·ac
Pronunciation: /ˈmānēˌak
 
/

noun

informal
1A person exhibiting extreme symptoms of wild behavior, especially when violent and dangerous: a homicidal maniac
More example sentences
  • He is not a homicidal maniac, but a violent, evil man made even more so by his addiction to unnamed drugs.
  • I lost several pounds and I looked like a maniac.
  • The driver was screaming like a maniac at this stage.
1.1 [with modifier] An obsessive enthusiast: a gambling maniac
More example sentences
  • I just don't think at any stage they are going to be able to make a credible case that he is some sort of right-wing maniac.
  • A night of petrol-fuelled hedonism is in store at Wimbledon Greyhound Stadium on Sunday where motor maniacs can admire a human canon ball, a monster truck, fire stunts and car crashes.
  • This was one for the war buffs amongst the motoring maniacs.
Synonyms
1.2 Psychiatry, archaic A person suffering from mania.

Origin

early 16th century (as an adjective): via late Latin from late Greek maniakos, from mania (see mania).

Derivatives

maniacal

Pronunciation: /məˈnīəkəl/
adjective
More example sentences
  • And they didn't do so out of some maniacal drive to accumulate a big pile of cash.
  • He glared at me with his fishy-looking eyes and flashed me a maniacal grin, showing all his yellow teeth.
  • Despite its proven stress-relieving effect, I will not indulge in maniacal laughter.

maniacally

Pronunciation: /məˈnīək(ə)lē/
adverb
More example sentences
  • The kitchen table is an unruly heap of evidence as Jordan, maniacally smoking, tells her sprawling story.
  • He ran around laughing maniacally when I told him to do things.
  • In the event that neither is true, feel free to laugh maniacally at me.

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Pronunciation: wēn
verb
be of the opinion; think or suppose