zásadnímu
"zásadnímu" is the dative singular masculine/neuter form of the Czech adjective "zásadní". This adjective translates to "fundamental," "essential," "crucial," "principal," or "basic" in English. It describes something that is of great importance or forms the basis of something else.
The dative case in Czech is used to indicate the indirect object of a verb, the object
Understanding the grammatical function of "zásadnímu" requires knowledge of Czech declension, specifically the case, number, and