edistyneimmän
"edistyneimmän" is the genitive singular form of the Finnish adjective "edistynyt." "Edistynyt" translates to "advanced," "developed," "progressive," or "enlightened" in English. The genitive case in Finnish is used to indicate possession, origin, or as a partitive object. Therefore, "edistyneimmän" specifically means "of the most advanced," "of the most developed," "of the most progressive," or "of the most enlightened."
The superlative form of the adjective is created by adding the suffix "-in" to the stem. In