Where does “tereddütsüz” come from?

tereddütsüz (Turkish) comes from Turkish -sız, from Ottoman Turkish ـسز, from Proto-Turkic *-siŕ — Used to form adjectives or nouns denoting the non-possession of a thing or quality; -less.

tereddütsüz (Turkish): Not having hesitation, not hesitating; unwavering, unhesitant, firm

Definitions

Not having hesitation, not hesitating; unwavering, unhesitant, firm

Ancestry of “tereddütsüz”, step by step

Step	Language	Word	Meaning
1	Turkish	-sız	Alternative form of -siz
2	Ottoman Turkish	ـسز	Suffix used to create adjectives not containing the noun; -less
3	Proto-Turkic	*-siŕ	Used to form adjectives or nouns denoting the non-possession of a thing or quality; -less

Every word from Proto-Turkic *-siŕ →Every word from Ottoman Turkish ـسز →Every word from Turkish -sız →