Definition of cardinal sin
: a very bad or serious sin in Christianity
—often used figuratively or humorously Giving false information is a cardinal sin in news reporting.He committed the cardinal sin of criticizing his boss.
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“Cardinal sin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cardinal%20sin. Accessed 14 May. 2021.
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