Phrases with the structure 非A非B are set expressions that need to be memorized. In the structure, we replace "A" and "B" with words that have similar meanings.
Here are some examples of these set expressions:
非驴非马 (neither ass nor horse)
非亲非故 (neither a relative nor a friend)
In the above structure, "A" and "B" can be replaced with nouns, adjectives or pronouns.
That avant-garde building is neither fish nor fowl. It’s difficult to classify and not suitable for this area