This is the 15410th most frequent Polish word.
specjalnymi
"Special" (instrumental plural form).
In this instance, 'specjalnymi' serves as an adjective, modifying plural nouns in the instrumental case, agreeing with 'przypadkami', meaning 'cases'.
Mamy do czynienia z specjalnymi przypadkami.
We are dealing with special cases.
Here, 'specjalnymi' modifies the plural noun 'opakowaniami' in the instrumental case, meaning 'packages', reflecting the uniqueness of the packaging.
Prezent jest zapakowany w specjalnymi opakowaniami.
The gift is wrapped in special packages.
The word 'specjalnymi' is used here as an adjective in the instrumental case, agreeing with the plural noun 'metodami', meaning 'methods'.