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Can anyone recommend a good thesaurus or resource for GW-style grimdark archaic words?

Because sometimes you just need a properly gothic synomym and MS Word ain't doing it.

Someone on here might be able to point you where you want to go:
http://www.steampunk.com/19th-century-language-resources/
I know it's not what you asked for, but like minds, and all that.

The Phrontistery is a good resource; specifically their Compendium of Lost Words, which I think might be just the ticket for you, KK.

GW grim/dark gothic is basically just psuedo latin.

Here's a pretty good list of english words with both germanic and latinate synonyms, and their base latin forms.

http://en.wikipedia.org/wiki/List_of_Germanic_and_Latinate_equivalents_in_English