Where does “perniciosissimo” come from?

perniciosissimo (Italian) comes from Italian pernicioso, from Latin perniciōsus, from Latin perniciēs, from Latin pernecō, from Latin necō, from Latin nex, from Proto-Italic neks, from Proto-Indo-European neḱs — to perish, disappear.

Ancestry of “perniciosissimo”, step by step

StepLanguageWordMeaning
1Italianperniciosopernicious
2Latinperniciōsusdestructive, ruinous, baleful, pernicious
3Latinperniciēsruin, destruction
4Latinpernecōto kill, slay outright
5Latinnecōto kill, murder (especially without physical wounding such as by poison or hunger)
6Latinnexmurder, slaughter, killing; violent death
7Proto-Italicneksdeath, slaughter
8Proto-Indo-Europeanneḱsdeath
9Proto-Indo-Europeanneḱ-to perish, disappear
Every word from Proto-Indo-European neḱ-