Where does “neústupnost” come from?

neústupnost (Czech) comes from Czech neústupný, from Czech ně-, from Czech ne, from Old Czech ne, from Proto-Slavic ne, from Proto-Balto-Slavic nē, from Proto-Indo-European né — not; no.

neústupnost (Czech): tenaciousness

Definitions

tenaciousness

Ancestry of “neústupnost”, step by step

Step	Language	Word	Meaning
1	Czech	neústupný	unyielding
2	Czech	ně-	some
3	Czech	ne	no!; not
4	Old Czech	ne	Negation particle; no, not
5	Proto-Slavic	ne	not
6	Proto-Balto-Slavic	nē	not
7	Proto-Indo-European	né	not; no

Every word from Proto-Indo-European né →Every word from Proto-Balto-Slavic nē →Every word from Czech ně- →