seinissä

Seinissä is a Finnish word form meaning "in the walls." It is the inessive plural form of the noun seinä, which means wall. The inessive case marks location inside something; the singular form is seinässä meaning "in the wall," while seinissä means "in the walls" or "inside walls" when referring to more than one wall or to a general sense of being inside walls.

In everyday language, seinissä is used to describe things located within walls, such as electrical cables or pipes: johdot kulkevat seinissä (the wires run inside the walls). Another example is water leaking because of pipes inside the walls: vesi vuotaa seinissä olevien putkien vuoksi. In architectural and construction contexts, the term appears in discussions about wall cavities, insulation, and hidden spaces that affect maintenance and renovation.

In written Finnish, seinissä is used mainly for literal descriptions of interior spaces, such as rooms or wall cavities. Like many locative phrases, it can carry subtle metaphorical implications about hidden or internal aspects, but it is not an established idiom with a fixed figurative meaning.

See also: Inessive case, Finnish grammar, Seinä, Seinät.