>>Dyspepsia - (noun)  - 1: indigestion; 2: disgruntlement

Interesting. Those are two entirely different definitions. Usually, they have something in common. If you were to use the word, you would have to provide contextural clues as to which definition you meant.

I can't decide whether the cause of my dyspepsia was the cafeteria chimichanga I had for lunch or my new boss. They both make me want to fart.