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 …

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

Of, concerning, or characteristic of the devil; satanic. 2. Appropriate to a devil, especially in degree of wickedness or cruelty....

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

diabolical, adj. & n. meanings, etymology, pronunciation and more in the Oxford English Dictionary

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

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.

Definition of diabolical adjective from the Oxford Advanced Learner's Dictionary. (especially British English, informal) extremely bad or annoying synonym terrible. The traffic was diabolical. It …

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, …