This is the 2083rd most frequent Polish word.
najwyższej
"Of the highest" or "supreme."
The word 'najwyższej' is used here as part of the phrase 'najwyższej jakości,' meaning 'of the highest quality.' It serves as a descriptor in a genitive attributive structure.
Jest to produkt najwyższej jakości.
This is a top-quality product.
Here, 'najwyższej' describes 'wysokości' (altitude) in a superlative form, expressing the greatest degree.
Ta góra jest najwyższej wysokości w regionie.
This mountain has the highest altitude in the region.
In this context, 'najwyższej' forms part of 'najwyższej klasy,' indicating a superlative hierarchy in the attributive genitive construction.