cardinal sin
Britishnoun
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theol any of the seven deadly sins
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informal an unforgivable error or misjudgment
lack of impartiality is considered a cardinal sin in broadcasting circles
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.
Before Robby and Al-Hashimi engage in any real ideological tussles, though, she commits the cardinal sin of suggesting they change the trauma center’s nickname to something else.
From Salon • Jan. 8, 2026
As Justice Sonia Sotomayor explained, this test favored certain denominations over others based on subjective judgments about their theological practices—a cardinal sin under the First Amendment’s establishment clause.
From Slate • Jun. 16, 2025
For most coaches, that is a cardinal sin.
From BBC • Mar. 17, 2025
The residents’ cardinal sin is placing all the responsibility on a single man, eager to wash their hands of any guilt.
From Los Angeles Times • Dec. 8, 2023
The cardinal sin, the one thing you were never, ever to do, was lose your keys.
From "Newjack: Guarding Sing Sing" by Ted Conover
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.
