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cardinal sin

noun
1.
(theol) any of the seven deadly sins
2.
(informal) an unforgivable error or misjudgment: lack of impartiality is considered a cardinal sin in broadcasting circles
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Contemporary definitions for cardinal sin
noun

a principal or prime misdeed; a serious error in judgment

Examples

He committed the cardinal sin of journalism.

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Encyclopedia Article for cardinal sin

any of the sins, usually numbering seven, dating back to the early history of Christian monasticism; they were grouped together as early as the 6th century by St. Gregory the Great. A sin was classified as deadly not merely because it was a serious offense morally but because "it gives rise to others, especially in the manner of a final cause" or motivation (St. Thomas Aquinas). The traditional catalog of the seven deadly sins is: (1) vainglory, or pride; (2) covetousness; (3) lust, understood as inordinate or illicit sexual desire; (4) envy; (5) gluttony, which usually included drunkenness; (6) anger; and (7) sloth. The classical discussion of the subject is in the Summa Theologica, by the 13th-century theologian St. Thomas Aquinas. The deadly sins were a popular theme in the morality plays and art of the European Middle Ages.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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