black sheep
noun /ˌblæk ˈʃiːp/
/ˌblæk ˈʃiːp/
[usually singular]- a person who is different from the rest of their family or another group, and who is considered bad or embarrassing
- the black sheep of the family
Word Originlate 18th cent.: from the proverb there is a black sheep in every flock.