neither fish nor fowl

/N IY1 DH ER0 F IH0 SH N AO0 R F AW0 L/
noun
  1. 1

    Something or someone which is not easily categorized; something or someone that does not rightly belong or fit well in a given group or situation.

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Source: https://en.wiktionary.org/wiki/neither%20fish%20nor%20fowl