Pronikajícího
Pronikajícího is the genitive singular masculine/neuter form of the Czech participle "pronikající." As a participle, it functions as an adjective or a verb. In its adjectival use, "pronikajícího" describes a masculine or neuter noun that is in the genitive case and is actively penetrating, piercing, or permeating something. For example, "světlo pronikajícího okna" would refer to the light of the penetrating window.
When used as a verbal form, "pronikajícího" indicates an ongoing action of penetrating, piercing, or permeating