Finnish word kaksinen comes from Proto-Uralic *kakta (Two.)

Detailed word origin of kaksinen

Dictionary entry	Language	Definition
*kakta	Proto-Uralic (urj-pro)	Two.
*kakci	Proto-Finnic (fiu-fin-pro)	Two.
kaksi	Finnish (fin)	Two.
kaksinen	Finnish (fin)	(idiomatic, used always with a negation verb and very often with the adverb kovin) Not too hot, nothing to write home about.

Words with the same origin as kaksinen