French Etymology Borrowed from Latin vitiōsus. See vice + -eux. Pronunciation IPA(key): /vi.sjø/ Audio:(file) Adjective vicieux (feminine vicieuse, masculine plural vicieux, feminine plural vicieuses) lecherous, perverted, depraved sly, deceitful; tricky (question) vicious (horse) (literary) wrong (word, pronunciation, etc.) Antonyms vertueux Derived terms cercle vicieux vicieusement Noun vicieux m (plural vicieux) pervert Further reading “vicieux”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012. Wikiwand - on Seamless Wikipedia browsing. On steroids.