galling

From gall + -ing. The adjective follows from the verb.

Nauja

1. Impudence or brazenness; temerity, chutzpah.
2. A gallbladder.
3. Bile, especially that of an animal; the greenish, profoundly bitter-tasting fluid found in bile ducts and gall bladders, structures associated with the liver.
4. Great misery or physical suffering, likened to the bitterest-tasting of substances.