adjective
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excruciatingly bad; outrageous
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(intensifier)
a diabolical liberty
Other Word Forms
Etymology
Origin of diabolical
First recorded in 1500–10; from Late Latin diabolicus ( see diabolic ( def. )) + -al 1 ( def. )
Explanation
Diabolical means "evil." This is a strong word. Too much math homework might seem unfair, but it probably isn't diabolical. Diabolical is related to the Spanish word diablo, which means "devil." In many religions and mythologies, you can't get any more evil than a devil, so diabolical is a powerful term, stronger than even despicable, which is another strong word for things that are hateful. Diabolical things are also intentional. If you got hit by lightning, that's awful and harmful, but it's not diabolical. If someone deliberately runs you over with a car, that's much more diabolical.
Vocabulary lists containing diabolical
Persepolis
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100 SAT Words Beginning with "D"
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Similes from Top AP English Exam Novels
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The Los Angeles Times described Mold-A-Ramas as “a diabolical cross between a jukebox and a pinball machine” that cost $3,600 apiece, or about $39,500 today.
From Los Angeles Times ● Aug. 10, 2026
In later works by Christie and others, diabolical deeds increasingly transpired in villages, hotels, trains, planes, boats and locked rooms.
From The Wall Street Journal ● Feb. 20, 2026
The promise remains dazzling and deliciously diabolical enough for adherents to forget that deals with the devil always come with a hidden, inescapable price tag.
From Salon ● Nov. 1, 2025
The student said the incident had had "a diabolical impact" on her.
From BBC ● Jul. 29, 2025
There was something diabolical about the mahout, and every time I looked up I found him grinning at me in an attitude of cheerful malice.
From "The Secret History" by Donna Tartt
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
