Etymology
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diabolical (adj.)

c. 1500, "pertaining to the devil," from diabolic + -al (1). Meaning "befitting the devil" is from 1540s. Related: Diabolically.

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Definitions of diabolical

diabolical (adj.)
showing the cunning or ingenuity or wickedness typical of a devil;
the diabolical expression on his face
Synonyms: devilish / diabolic / mephistophelian / mephistophelean
diabolical (adj.)
extremely evil or cruel; expressive of cruelty or befitting hell;
diabolical sorcerers under the influence of devils
From wordnet.princeton.edu