Sileimmällä
Sileimmällä is a Finnish word that translates to "smoothest" or "on the smoothest" in English. It is the adessive case of the superlative form of the adjective "sileä," which means smooth. The adessive case in Finnish indicates location on or at, or possession in some contexts. Therefore, "sileimmällä" can refer to the smoothest surface, the smoothest part of something, or a state of being on the smoothest path.
The word is used descriptively to highlight a particular quality of smoothness when comparing multiple items
The Finnish language has a rich case system, and the adessive case, particularly when applied to superlatives