No, squalid is an adjective. The noun form is squalor.
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The room they were living in was squalid.
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The word "squalid" is used to describe a place that is extremely
dirty and disgusting. An example of a sentence that uses the word
would be: Being in that squalid apartment made her skin crawl.
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The adjective form of "squalor" is "squalid."
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The abandoned building was in a squalid condition, with trash and debris strewn everywhere.