Menestyviin
Menestyviin is a Finnish grammatical form, specifically the illative plural inflection of the adjective menestyvä, meaning “prosperous” or “successful.” In Finnish, the illative case indicates motion toward or into something, and its plural form combines with a plural noun. The illative plural suffix -iin attaches to the stem menestyvi- derived from menestyvä, producing menestyviin.
Menestyviin is used before a plural noun in illative, for example: menestyviin maihin (“to prosperous countries”)
Usage notes: In everyday speech, languages speakers might opt for more general phrasing, but menestyviin appears
Etymology and morphology: The base adjective is menestyvä (“prosperous”). It derives from the noun menestys (success).
See also: Finnish grammar, illative case, adjectives, inflection.