Synonyms of neither fish nor fowl in English:

neither fish nor fowl


See definition of neither fish nor fowl (nor good red herring)

phrase

1‘here's a work that is obscure only because it is neither fish nor fowl’

SYNONYMS
ambiguous, doubtful, unclear, uncertain, indistinct, indefinite, indeterminate, open to question, debatable
mixed, neither one thing nor the other