1. neither fish nor fowl - Adjective
2. neither fish nor fowl - Phrase
neither fish nor fowl (not comparable)
(idiomatic) Not easily categorized; not rightly belonging or fitting well in a given group or situation; also, not having the advantages of the various options.
Synonyms: neither fish, flesh, nor fowl; neither fish, flesh, nor good red herring; neither fish nor flesh; neither fish nor flesh, nor good red herring
Because, being neither fish nor fowl, it is usually only clear when you are failing to hit the mark with it. Source: Internet
We’re in it but not of it, neither fish nor fowl. Source: Internet