the odd one out

US /ðɪ ˌɑːd wʌn ˈaʊt/
UK /ðɪ ˌɑːd wʌn ˈaʊt/
"the odd one out" picture
1.

a person or thing that is different from or excluded from others in a group or series

:
•
In this group of fruits, the apple is the odd one out because all the others are berries.
•
He always felt like the odd one out in his family because he was the only artist.
:
exceptionanomalyoutliermisfitmaverick
:
oddsoddat oddsover the oddsodds and endsit makes no oddsone-on-one