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adjective
murky - Having dark and gloomy atmosphere, usually as a result of a dirty water or a thick mist
risqué - Somewhat indecent and liable to shock, especially by being sexually suggestive.
raunchy - Earthy, vulgar, and often sexually explicit
noun
splotch - A daub, blot, or smear of something, typically a liquid
verb
tarnish - To cause a metal to lose its shine, especially as a result of exposure to air or moisture
scuff - Scrape or brush the surface of (a shoe or other object) against something