Noun: odd man out (odd men out)
- Someone regarded as eccentric or crazy and standing out from a group
"The neighbourhood odd man out was known for his outlandish conspiracy theories";
- kook [N. Amer, informal], odd fellow, odd fish [informal], queer bird [informal], queer duck [informal], odd bod [Brit, informal], odd one out
Derived forms: odd men out
Encyclopedia: Odd man out