Where does “vastuu” come from?

vastuu (Finnish) comes from Finnish vastata, from Proto-Finnic vastat'ak.

vastuu (Finnish): responsibility, charge; "see also:" in charge;...

Definitions

Step	Language	Word	Meaning
1	Finnish	vastata	to answer , to reply to; to respond to; to react,...
2	Proto-Finnic	vastat'ak	—

vastuu — Etymology, Origin & Word History | Etymology Explorer