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
And viewpoint-based discrimination is a cardinal sin under the First Amendment.
From Slate ● Oct. 7, 2025
For most coaches, that is a cardinal sin.
From BBC ● Mar. 17, 2025
Roman, a.k.a. the Grim Weeper, is in a weaker position than ever, having committed the cardinal sin of appearing vulnerable in front of the wrong people when he totally lost it at Logan’s funeral.
From Los Angeles Times ● May 28, 2023
He had committed the cardinal sin of putting his own interests ahead of the organization and the people.
From "Long Walk to Freedom" by Nelson Mandela
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.
