läpipääsemätön

läpipääsemätön is a Finnish adjective that translates to "impenetrable" or "unpassable" in English. It is used to describe something that cannot be passed through, penetrated, or overcome.

The word is formed by combining the verb "päästä" (to get, to pass) with the prefix "läpi" (through) and the negative suffix "-mätön" (im- or un-). Thus, "läpipääsemätön" literally means "cannot be passed through."

It can be applied to physical obstacles, such as a dense forest that is läpipääsemätön, meaning no one can get through it. It can also describe abstract concepts, like a läpipääsemätön logic or a läpipääsemätön argument, implying that it is impossible to find a flaw or to counter it.

In a figurative sense, läpipääsemätön can also refer to a person's demeanor or expression that is unreadable or unyielding. For example, someone with a läpipääsemätön poker face is one whose emotions cannot be discerned. The term emphasizes a complete lack of permeability or vulnerability to external forces or understanding.