black sheep
US /blæk ʃiːp/
UK /blæk ʃiːp/

1.
厄介者, のけ者
a member of a family or group who is regarded as a disgrace to them
:
•
He was always considered the black sheep of the family because of his unconventional lifestyle.
彼は型破りなライフスタイルのため、常に家族の厄介者と見なされていた。
•
Every organization has its black sheep, but we try to support everyone.
どの組織にも厄介者はいるが、私たちは皆をサポートしようと努めている。