Usage Note
rustre describes a coarse, uncultured person — someone with rough manners. It can function as both a noun (un rustre) and an adjective (un comportement rustre). The word carries a distinctly literary or slightly old-fashioned feel; goujat or malotru are common near-synonyms.
Examples
"Quel rustre, il ne dit même pas merci !"
Natural Translation
What a boor — he doesn't even say thank you!

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