Sleaze
来自Big Physics
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1960s: back-formation from sleazy.
wiktionary
Back-formation from sleazy, originally used to describe the thinness and low quality of cloth.
etymonline
sleaze (n.)
"condition of squalor," by 1967, back-formation from sleazy. Meaning "person of low moral standards," and the adjectival use, are attested from 1976.