Where does “vakavakasvoinen” come from?

vakavakasvoinen (Finnish) comes from Finnish kasvo, from Veps kazda, from Proto-Finnic kasvadak, from Proto-Indo-European h₂ewks-.

Ancestry of “vakavakasvoinen”, step by step

vakavakasvoinen traces back through two separate lines of ancestry.

via Finnish kasvo

StepLanguageWordMeaning
1Finnishkasvoface; face, figure
2Vepskazdato grow; to grow up; to increase
3Proto-Finnickasvadakto grow
4Proto-Indo-Europeanh₂ewks-

via Finnish vakava

StepLanguageWordMeaning
1Finnishvakavaserious; grave, sombre, solemn
2Finnish-vaForms the present active participle of a verb,...
3Proto-Finnic-pa-ing; forms the present participle, which is...
4Proto-Uralic-pa
Every word from Proto-Indo-European h₂ewks-Every word from Proto-Finnic kasvadakEvery word from Veps kazda