Rude or impolite behavior; a disrespectful act or remark.
From Middle English, combining dis- (opposite of) with courtesy (from Old French 'cortoisie'). The word emerged in Middle English to describe behavior that violated courtly standards of politeness.
In medieval times, 'courtesy' was literally taught as a skill to nobles—like a manual of etiquette—so calling someone discourteous was like saying they failed a basic class in how to behave!
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