Bête Noir 

1. A French saying, usually referring to a person, that you particularly despise. Not often seen in common use, and not often easy to slip into a sentence. Generally, a fun but difficult term.

2. The primary antagonist of an Undertale animated series called ‘Glitchtale’ by Camilla Cuevas. (Even less often used)

P1: You know John?
P2: Yeah, that bastards my Bête Noir.
P1: That sounds stupid.

Bête Noir by Octagonal Revolver April 2, 2022