That has not been cleaned; dirty or foul; uncleansed.(adjective)
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Use "uncleaned" in a sentence
"The company now occupies the entire floor, but that room, which she still works in occasionally, has remained unchanged and, apparently, uncleaned for 25 years."
"Worse, they took the ramrod and stuck it into the uncleaned barrel, so that the brass on the rod was oxidized by the pyrodex."
"If left unattended and uncleaned substantial corrosion can form in the breech/barrel/nipple."