diabolic

or di·a·bol·i·cal

[ dahy-uh-bol-ik or dahy-uh-bol-i-kuh l ]
/ ˌdaɪ əˈbɒl ɪk or ˌdaɪ əˈbɒl ɪ kəl /

adjective

having the qualities of a devil; devilish; fiendish; outrageously wicked: a diabolic plot.
pertaining to or actuated by a devil.

Origin of diabolic

1350–1400; Middle English diabolik (< Middle French) < Late Latin diabolicus < Greek diabolikós, equivalent to diábol(os) devil + -ikos -ic

Related forms

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for diabolical

British Dictionary definitions for diabolical (1 of 2)

diabolical

/ (ˌdaɪəˈbɒlɪkəl) /

adjective informal

excruciatingly bad; outrageous
(intensifier)a diabolical liberty

Derived Forms

diabolically, adverbdiabolicalness, noun

British Dictionary definitions for diabolical (2 of 2)

diabolic

/ (ˌdaɪəˈbɒlɪk) /

adjective

of, relating to, or proceeding from the devil; satanic
befitting a devil; extremely cruel or wicked; fiendish
very difficult or unpleasant

Derived Forms

diabolically, adverbdiabolicalness, noun

Word Origin for diabolic

C14: from Late Latin diabolicus, from Greek diabolikos, from diabolos devil
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