Where does “täysjärkinen” come from?

täysjärkinen (Finnish) comes from Finnish täys-, from Finnish täysi, from Proto-Finnic täüci, from Proto-Uralic täwde — full.

Ancestry of “täysjärkinen”, step by step

StepLanguageWordMeaning
1Finnishtäys-A prefix used to signify completeness. English...
2Finnishtäysifull
3Proto-Finnictäücifull
4Proto-Uralictäwdefull
Every word from Proto-Uralic täwde →Every word from Proto-Finnic täüci →Every word from Finnish täysi →