Where does “vastissimo” come from?

vastissimo (Italian) comes from Italian Vasto, from Latin vastus, from Proto-Celtic wāstos, from Proto-Indo-European h₁weh₂- — to leave, abandon, give out.

Ancestry of “vastissimo”, step by step

StepLanguageWordMeaning
1ItalianVastovast
2LatinvastusEmpty, unoccupied, i.e. waste, desert; Desolate,...
3Proto-Celticwāstosempty
4Proto-Indo-Europeanh₁weh₂-to leave, abandon, give out
Every word from Proto-Indo-European h₁weh₂- →Every word from Proto-Celtic wāstos →Every word from Latin vastus →