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"unclean" is also used as a crossword clue. If that's what you saw, the answer is often polluted (8 letters).
Definitions
soiled or likely to soil with dirt or grime
Word origin
From Middle English unclene, from Old English unclǣne, equivalent to un- + clean.
Used in a sentence
“They were gnawing, like beasts, upon unclean food. A pot boiled upon the edge of the fire, and out of it one of the creatures would occasionally drag a hunk of meat with a sharpened stick.”
“I stand amazed in the presence / Of Jesus, the Nazarene, / And wonder how He could love me, / A sinner, condemend, unclean.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Not sanitary”7 letters
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