This is the 189th most frequent Romanian word.
bune
The Romanian word "bune" means "good" (plural form, feminine).
In this sentence, "bună" is used as an adjective in the singular feminine form to describe the noun "mâncarea" (food).
Mâncarea de la acest restaurant este foarte bună.
The food from this restaurant is very good.
Here, "buni" is the plural masculine form of the adjective, referring to "pantofi" (shoes).
Acești pantofi sunt foarte buni pentru drumeție.
These shoes are very good for hiking.
In this context, "bună" is again used in the singular feminine form, describing the noun "idee" (idea).