I use niggardly fairly often. It's priceless when people give me this look like I just fingerbanged their cat.
There was a congressman some years ago whose name I can't remember who enjoyed using "niggardly" in congressional meetings. It used to make the nig nogs in the HoR flip out. I guess it was kind of a plausibly deniable fuck you to the likes of Maxine Waters and Charlie Rangel.