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[muh-nahy-uh-kuh l] /məˈnaɪ ə kəl/
of or relating to mania or a maniac.
Origin of maniacal
1670-80; maniac + -al1
Related forms
maniacally, adverb
postmaniacal, adjective
premaniacal, adjective
submaniacal, adjective
submaniacally, adverb
unmaniacal, adjective
unmaniacally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for maniacal
  • 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.
  • The evil face of that campaign was the dastardly, maniacal robot.
  • We think of science as rational but it isn't: it's obsessive, maniacal, driven to extremes of detail.
  • Single line, focused distribution with maniacal devotion to customer enthusiasm.
  • He approached the painstaking and exhausting work with almost maniacal dedication.
British Dictionary definitions for maniacal


affected with or characteristic of mania
characteristic of or befitting a maniac: maniacal laughter
Derived Forms
maniacally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for maniacal

1670s, from maniac (adj.) + -al (1). Related: Maniacally.

Online Etymology Dictionary, © 2010 Douglas Harper
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maniacal in Medicine

maniacal ma·ni·a·cal (mə-nī'ə-kəl) or ma·ni·ac (mā'nē-āk')
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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