drsných
The word "drsných" is a Czech adjective. It is the genitive plural masculine or neuter form of the adjective "drsný." The base adjective "drsný" has several meanings, primarily relating to coarseness, roughness, or harshness.
In a literal sense, "drsný" can describe a rough surface, such as coarse sandpaper or rugged terrain.
The form "drsných" specifically indicates possession or is used after certain prepositions in the genitive case,