Where does “Νημερτής” come from?

Νημερτής (Ancient Greek) comes from Ancient Greek νημερτής, from Ancient Greek -ής, from Proto-Indo-European -ēs, from Proto-Indo-European -ess, from Proto-Indo-European -os — Creates action nouns or result nouns from verbs;...

Νημερτής (Ancient Greek): Nemertes, a nereid in Greek mythology; a nereid...

Definitions

Nemertes, a nereid in Greek mythology; a nereid...

Ancestry of “Νημερτής”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	νημερτής	Not making mistakes: unerring, infallible, sure
2	Ancient Greek	-ής	adjective suffix
3	Proto-Indo-European	-ēs	Primarily forms adjectival bahuvrīhi compounds
4	Proto-Indo-European	-ess	—
5	Proto-Indo-European	-os	Creates action nouns or result nouns from verbs;...

Every word from Proto-Indo-European -os →Every word from Ancient Greek -ής →Every word from Proto-Indo-European -ēs →