maniacal

[muh-nahy-uh-kuhl]
adjective
of or pertaining to mania or a maniac.

Origin:
1670–80; maniac + -al1

maniacally, adverb
postmaniacal, adjective
premaniacal, adjective
submaniacal, adjective
submaniacally, adverb
unmaniacal, adjective
unmaniacally, adverb
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World English Dictionary
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

maniacal
1670s, from maniac. Related: Maniacally.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

maniacal ma·ni·a·cal (mə-nī'ə-kəl) or ma·ni·ac (mā'nē-āk')
adj.
Suggestive of or afflicted with insanity.

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
Top among them was a spate of maniacal diversification.
But it does require a maniacal devotion, especially in these crucial days.
Her maniacal intensity is comic, camp, and surprisingly effective.
The maniacal gleam in his eye hints at an inner lunatic about to erupt.
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