noun
also bête noir ˌbetnəˈwär, betˈnw-, -āt-, -wȧ(r
( plural bêtes noires also bêtes noirs -är(z), -ȧz, -ȧ(r)
Etymology: French bête noire, literally, black beast
: a person or thing usually strongly and persistently detested, feared, or avoided
an idiosyncratic driver whose bête noir was the left turn — Marylin Bender