Usage Note
Lépreux refers literally to a person with leprosy (la lèpre), a bacterial disease. Figuratively, traiter quelqu'un comme un lépreux means to treat someone as a social pariah. The feminine form is lépreuse. The adjective lépreux also describes buildings with peeling, diseased-looking walls.
Examples
"Au Moyen Âge, les lépreux étaient isolés de la société."
Natural Translation
In the Middle Ages, lepers were isolated from society.

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