Where does “nezabudnúť” come from?

nezabudnúť (Slovak) comes from Slovak ne-, from Proto-Slavic ne, from Proto-Balto-Slavic nē, from Proto-Indo-European né — not; no.

Ancestry of “nezabudnúť”, step by step

StepLanguageWordMeaning
1Slovakne-forms negative verbs
2Proto-Slavicnenot
3Proto-Balto-Slavicnēnot
4Proto-Indo-Europeannénot; no
Every word from Proto-Indo-European né →Every word from Proto-Balto-Slavic nē →Every word from Proto-Slavic ne →