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

When Ahab first speaks to the crew about Moby Dick, his diabolical charisma soon infects the men who, apart from Starbuck, enthusiastically join him in his monomaniacal crusade. — Literary Hub, 6 July 2026

From perhaps the most diabolical spot on the entire course. — Brendan Quinn, New York Times, 20 June 2026

In this rendition, the diabolical duo of Todd and Lovett are younger, more wiry, more tightly wound and thus more dangerous. — Christopher Arnott, Hartford Courant, 16 June 2026

Consider, for example, his approach to one of the most diabolical tasks in the show’s history, in which players were challenged to complete seven different sub-tasks without any hint of the correct order. — Matthew Jackson, Vulture, 12 June 2026

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