perinteisin
Perinteisin is a Finnish adjective meaning the most traditional. It serves as the superlative form of perinteinen and is used to describe something that adheres most closely to established customs, practices, or traditions. The word is commonly used in cultural, culinary, and craft contexts to compare options within a group.
In usage, perinteisin modifies a noun in the nominative singular as in "Tämä on perinteisin tapa järjestää
Etymology: the base is perinne, meaning tradition, with the adjective derived as perinteinen, and the superlative
See also: perinne, perinteinen, perinteisempi, perinteisimmän.