Like the word devil, "diabolical" traces back to Latin diabolus, which itself descends from Greek diabolos, a word that literally means "slanderer." 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; examples include "diabolical lore," "a diabolical grin," and "a diabolical plot." In British slang, "diabolical" can also mean "disgraceful" or "bad," as in "the food was diabolical."
the police quickly mobilized to track down the diabolical criminals before they struck again
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Follow the delightfully diabolical writer of this newsletter on social media @jimreineking.—Jim Reineking, USA Today, 31 Mar. 2025 Watch Justice League on Max Joker (2019) 2019's Joker took the darkest approach yet to the diabolical character, starring Joaquin Phoenix as a severely mentally ill man struggling to become a comedian and descending into madness.—Rebecca Aizin, People.com, 9 Apr. 2025 But in a more pointed, diabolical way for this afternoon’s players, the sheer density of talent bunched just millimeters behind Pletcher’s River Thames approximates that of a black hole that very well can suck River Thames right down and out into oblivion.—Guy Martin, Forbes.com, 8 Apr. 2025 The strangeness begins with that Godlike narrator, who flicks a diabolical tail.—James Wood, New Yorker, 7 Apr. 2025 See All Example Sentences for diabolical
Word History
Etymology
diabolical from diabolic + -ical; diabolic going back to Middle English deabolik, borrowed from Middle French & Late Latin; Middle French dyabolique, borrowed from Late Latin diabolicus, borrowed from Late Greek diabolikós, going back to Greek, "slanderous," from diábolos "accuser, backbiter, slanderer" + -ikos-ic entry 1 — more at devil entry 1
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