vnútorného
The Slovak word "vnútorného" is the genitive singular masculine/neuter form of the adjective "vnútorný". This adjective translates to "inner", "internal", "interior", or "inward" in English. It describes something that is located or exists inside, rather than on the outside, or something that pertains to the mind, emotions, or spirit.
For example, "vnútorného života" would refer to one's "inner life" or "spiritual life". "Vnútorného priestoru" would