Synonyms of diabolical

diabolical

adjective

ˌdī-ə-ˈbä-li-kəl 

variants or diabolic

as in demonic

of, relating to, or worthy of an evil spirit

the police quickly mobilized to track down the diabolical criminals before they struck again

Synonyms & Similar Words

• demonic
• sinister
• malicious
• satanic
• fiendish
• devilish
• demoniac
• wicked
• evil
• vicious
• infernal
• Luciferian
• cruel
• ferocious
• demonian
• malignant
• malevolent
• hellish
• savage
• cacodemonic
• heinous
• nefarious
• vile
• monstrous
• villainous
• iniquitous
• baleful
• immoral
• barbarous
• inhuman

Antonyms & Near Antonyms

• angelic
• celestial
• heavenly
• benign
• benevolent
• beneficent
• holy
• moral
• good
• godly
• ethical
• virtuous
• saintly
• righteous
• benignant
• sainted

Example Sentences

Recent Examples of diabolical

Might be nice to reconnect; might also be absolutely diabolical running into each other in the crisps aisle at Waitrose. — Lauren O’Neill, Vogue, 22 Aug. 2026

What outrages Marylanders is that this diabolical plan excludes the Preakness, devaluing it and implying the Triple Crown is irrelevant, if not dead. — Stephen J. K. Walters, Baltimore Sun, 12 Aug. 2026

The late Lance Reddick is a delight in one of his final roles, as their diabolical CEO. — Judy Berman, Time, 11 Aug. 2026

The actress also had a memorable guest turn on The Vampire Diaries and reunited with Ben McKenzie for a diabolical three-episode run on Gotham. — Kevin Jacobsen, Entertainment Weekly, 5 Aug. 2026

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