diabolical.
Of or concerning the devil: devilish, satanic.
Meaning & usage
Of or concerning the devil: devilish, satanic.
Extremely wicked or cruel.
a diabolical plan
(Devilishly) cunning or devious.
Crazy, wild (sometimes especially due to being unexpected or surprising).
Where this word comes from
Etymology tree Proto-Indo-European *dwóh₁ ▲ Proto-Indo-European *trísinflu. Proto-Indo-European *dwísder. Ancient Greek διά (diá) Ancient Greek δια- (dia-) Proto-Indo-European *gʷelH-der. Proto-Hellenic *gʷəlnō Ancient Greek βάλλω (bállō) Ancient Greek διαβάλλω (diabállō) Ancient Greek διάβολος (diábolos) Proto-Indo-European *-kos Proto-Hellenic *-kos Ancient Greek -κός (-kós) Ancient Greek -ικός (-ikós) Koine Greek διαβολικός (diabolikós)bor. Late Latin diabolicusbor. Middle French diaboliquebor. Middle English diabolik English diabolic English -al English diabolical From diabolic + -al.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.