bete noire \bet-NWAHR\, noun:
Something or someone particularly detested or avoided; a bugbear.
This is a hard one because I keep wanting to use it as an adjective....
Currently in Ohio there is an outbreak of bedbugs, one of the bete noires of life.
I think French words are bete noire...having all those letters you don't pronounce, detestable.
~Zoo
If you think french is Bete Noire, you must really hate English!