answer is evastun

evastun = answer (noun) (some things Google found for "evastun": a rare term; name of the Spanish website and twitter account for Escuela Valle Astún (Astún Valley (Ski) School); similar Vastun is a rare last name; similar Vasstun is the name of a place in Norway)

Word derivation for "answer"
Basque = erantzun, Finnish = vastaus
Miresua = evastun

This snippet is from the Mad Tea-Party scene:

"Have you guessed the riddle yet?" the Hatter said, turning to Alice again.
"No, I give it up," Alice replied: "what's the answer?"

The riddle was "Why is a raven like a writing-desk?" The Hatter asked Alice a riddle that had no answer.