Where does “certissimo” come from?

certissimo (Italian) comes from Italian certo, from Latin certus, from Proto-Indo-European krey- — to sift, separate, divide.

Ancestry of “certissimo”, step by step

StepLanguageWordMeaning
1Italiancertocertain, sure; reliable; real, true
2Latincertuscertain; fixed, settled, firm; resolved,...
3Proto-Indo-Europeankrey-to sift, separate, divide
Every word from Proto-Indo-European krey- →Every word from Latin certus →Every word from Italian certo →
certissimo — Etymology, Origin & Word History | Etymology Explorer