In English, "diabolical" has many nuances of meaning. It can describe the devil himself (as in "my diabolical visitor") or anything related to or characteristic of him in appearance, behavior, or thought; …

DIABOLICAL definition: having the qualities of a devil; devilish; fiendish; outrageously wicked. See examples of diabolical used in a sentence.

Morally wrong and evil (Definition of diabolical from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Define diabolical. diabolical synonyms, diabolical pronunciation, diabolical translation, English dictionary definition of diabolical. also di·a·bol·ic adj. 1. Of, concerning, or characteristic of the devil; satanic. 2. …

Definition of diabolical adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

If you describe something as diabolical, you are emphasizing that it is very bad, extreme, or unpleasant.

Factsheet What does the word diabolical mean? There are six meanings listed in OED's entry for the word diabolical. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Of, concerning, or characteristic of the devil; satanic. 2. Appropriate to a devil, especially in degree of wickedness or cruelty. [From Middle English deabolik, from Old French diabolique, from Late Latin …

Jul 22, 2025 · (slang) Crazy, wild (sometimes especially due to being unexpected or surprising).

Diabolical often describes a plot, scheme, etc., that is very clever and that is intended for an evil purpose.