Where does “salavihkaisesti” come from?

salavihkaisesti (Finnish) comes from Finnish salavihkainen, from Finnish salavihkaa, from Finnish sala, from Proto-Finno-Ugric *sala, from Proto-Uralic śala — elm.

Ancestry of “salavihkaisesti”, step by step

StepLanguageWordMeaning
1Finnishsalavihkainenfurtive, stealthy
2Finnishsalavihkaasecretly, furtively, stealthily
3FinnishsalaA secret
4Proto-Finno-Ugric*sala
5Proto-Uralicśalaelm
Every word from Proto-Uralic śalaEvery word from Proto-Finno-Ugric *salaEvery word from Finnish sala