Where does “sisuinen” come from?

sisuinen (Finnish) comes from Finnish sisu, from Finnish sisä-, from Proto-Finnic sicä, from Proto-Uralic śićä.

Ancestry of “sisuinen”, step by step

StepLanguageWordMeaning
1Finnishsisuperseverance, doggedness, stubbornness, grit,...
2Finnishsisä-inner, internal, interior, inward; indoor; inland
3Proto-Finnicsicäinsides, inside
4Proto-Uralicśićä—
Every word from Proto-Uralic śićä →Every word from Finnish sisä- →Every word from Finnish sisu →