Breakdown of Kumpikaan ei ole kiinnostunut tästä harrastuksesta.
tämä
this
olla
to be
ei
no / not (en, et, ei, emme, ette, eivät)
kumpikaan
neither one
Questions & Answers about Kumpikaan ei ole kiinnostunut tästä harrastuksesta.
How does the -kaan suffix work in the word kumpikaan?
The word kumpikaan is built from the question word kumpi ("which one of two") and the suffix -kaan. Because Finnish uses double negatives, it pairs with the negative verb ei to mean "neither one" (of two people or things).
Can I use kukaan (nobody) instead of kumpikaan here?
You would use kukaan if you were talking about a larger group ("Nobody is interested"). You use kumpikaan specifically when there are exactly two people or options involved ("Neither of the two is interested").
Why are tästä and harrastuksesta in the elative case (-sta/-stä)?
In English, you are interested "in" something. In Finnish, the word kiinnostunut (interested) requires the target to be in the elative case (-sta/-stä, usually meaning "out of"). So you are literally interested "out of this hobby" (tästä harrastuksesta).
Why does kiinnostunut end in -nut?
The ending -nut shows it is a past participle of the verb kiinnostua ("to get interested"). Here, it acts just like a regular adjective meaning "interested". Words ending in -nut/-nyt often describe a current state that resulted from a past action.