This is the 1074th most frequent Polish word.
inna
"Inna" means "different" or "another" (feminine form) in English.
The word 'innej' here is the feminine singular genitive form of 'inna', meaning 'different' or 'another', modifying the noun 'potrawy' (dish).
Chciałbym spróbować innej potrawy.
I would like to try a different dish.
The word 'inna' is in the feminine singular nominative form, matching the noun 'opinie' (opinions, plural but treated as a singular concept in Polish) meaning 'another' or 'different'.
Każdy ma swoje inna opinie.
Everyone has their own different opinions.
'Inną' is the feminine singular accusative form of 'inna', since it modifies 'książkę' (book) and the verb 'pokazać' (to show) requires accusative case for its direct object.