Where does “perniciosissimus” come from?

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

Ancestry of “perniciosissimus”, step by step

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