Word Origin & History
sleazy
1644, "hairy, fuzzy," later "flimsy, unsubstantial" (1670), of unknown origin; one theory traces it somehow to Silesian "of the eastern German province of Silesia" (Ger. Schleisen), where fine linen or cotton fabric was made (Silesia in ref. to cloth is attested in Eng. from 1674; and Sleazy as an abbreviated form is attested from 1670, but OED is against this). Sense of "sordid" is from 1941; sleaze (n.) "condition of squalor" is a 1967 back-formation; meaning "person of low moral standards," and the adj. form, are attested from 1976.