maniac

[mey-nee-ak]
noun
1.
a raving or violently insane person; lunatic.
2.
any intemperate or overly zealous or enthusiastic person: a maniac when it comes to details.
adjective

Origin:
1595–1605; < Medieval Latin maniacus of, pertaining to madness. See mania, -ac

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World English Dictionary
maniac (ˈmeɪnɪˌæk)
 
n
1.  a wild disorderly person
2.  a person who has a great craving or enthusiasm for something: a football maniac
3.  obsolete psychiatry a person afflicted with mania
 
[C17: from Late Latin maniacus belonging to madness, from Greek]

maniacal or maniac (məˈnaɪəkəl, ˈmeɪnɪæk)
 
adj
1.  affected with or characteristic of mania
2.  characteristic of or befitting a maniac: maniacal laughter
 
maniac or maniac
 
adj
 
ma'niacally or maniac
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

maniac
1604, from Fr. maniaque, from L.L. maniacus, from Gk. maniakos, from mania (see mania). The noun is attested from 1763, from the adj.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

maniac ma·ni·ac (mā'nē-āk')
n.
An insane person.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
On one hand, the idea of a crazy maniac on board is spine chilling.
In the same vein, someone who is extremely cool is considered either fresh or maniac.
It ends with a maniac nurse on the loose trying to take over all students'
  minds.
We supported this blood soaked maniac, now it is our duty to help those
  opposing his tyranny.
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