Word help please.subfuscous, slightly dark, dusky or somber what is the most common use for subfuscous sentence wise ?

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Of a dull, dusky, darkish colour; brownish; blackish ...

Freq. in scientific contexts.

- Oxford English Dictionary

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There is no common use for the word. "Subfuscous" is primarily a technical term used in zoological descriptions (see examples in Google Books https://www.google.com/search?q=%22subfuscous%22&b... ) and it won't be in the vocabulary of most native speakers.

Its use in the phrase "his increasingly subfuscous wardrobe" is the mark of a writer who has looked up a word in a thesaurus and used it without checking what its normal context is.

The author is just saying that this guy's clothes are starting to get dark with dirt.

"Squalorous" is along the same lines: a vanishingly rare synonym for "squalid" - only 354 hits in Google Books.

I have never heard of it in my entire life, and had to look it up to make sure it was an actual word.

half-cast, or latino