英文有沒有成語或單字形容《食之無味,棄之可惜》的呢?

The tasteless of the food, leave it unfortunately

i bet not

not every chinese phrases can be directly translated to english
especially when the "雞肋 and 食之無味,棄之可惜" came from 文言文~

this is the uniqueness of languages

有的!
Hardly worth eating but not bad enough to throw away.