demoniac

[dih-moh-nee-ak, dee-muh-nahy-ak]
adjective Also, demoniacal [dee-muh-nahy-uh-kuhl] .
1.
of, pertaining to, or like a demon; demonic: demoniac laughter.
2.
possessed by or as by an evil spirit; raging; frantic.
noun
3.
a person seemingly possessed by a demon or evil spirit.

Origin:
1350–1400; Middle English < Late Latin daemoniacus < Greek daimoniakós, equivalent to daimóni(os) pertaining to a daemon + -akos -ac

demoniacally [dee-muh-nahy-ik-lee] , adverb


1. angelic.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
demoniac (dɪˈməʊnɪˌæk)
 
adj
1.  of, like, or suggestive of a demon; demonic
2.  suggesting inner possession or inspiration: the demoniac fire of genius
3.  frantic; frenzied; feverish: demoniac activity
 
n
4.  a person possessed by an evil spirit or demon
 
demo'niacally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

demoniac
late 14c., from L.L. dæmoniacus (c.200), from Gk. daimonion, from daimon (see demon).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There are times when a cackle of demoniac laughter is the sole salvation of sanity.
If war has its chivalry and its pageantry, it has also its hideousness and its demoniac woe.
Or by the owl, as he greeted the moon with demoniac laughter.
He ascribes to demoniac agency all his despairing thoughts and suicidal purposes.
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