Noun
Rudeness of behavior or language; ill manners; manifestation of disrespect; incivility.
Source: Webster's dictionaryBe calm in arguing; for fierceness makes error a fault, and truth discourtesy. George Herbert
If the pages of this book contain some successful verse, the reader must excuse me the discourtesy of having usurped it first. Our nothingness differs little; it is a trivial and chance circumstance that you should be the reader of these exercises and I their author. Jorge Luis Borges
Most problems are best solved privately, not through government. There's a problem of discourtesy in the world, which is best handled through social norms, which are indispensable. But you wouldn't want the government to be mandating courtesy. Cass Sunstein
Discourtesy does not spring merely from one bad quality, but from several--from foolish vanity, from ignorance of what is due to others, from indolence, from stupidity, from distraction of thought, from contempt of others, from jealousy. Jean de La Bruyère
I would not have had that happen to you. Discourtesy is unspeakably ugly to me. Thomas Harris
An excess of courtesy is a discourtesy. Japanese Proverb