Where does “stultitia” come from?

stultitia (Latin) comes from Latin -itia, from Latin -ia, from Latin -ius, from Proto-Italic -jōs, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

stultitia (Latin): Folly, stupidity, foolishness, simplicity,...

Definitions

Folly, stupidity, foolishness, simplicity,...

Ancestry of “stultitia”, step by step

Step	Language	Word	Meaning
1	Latin	-itia	-ness, -ity
2	Latin	-ia	Used to form a feminine abstract noun, usually...
3	Latin	-ius	forming adjectives from nouns; nominative neuter...
4	Proto-Italic	-jōs	Forms comparative adjectives
5	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Every word from Proto-Indo-European -yós →Every word from Latin -ia →Every word from Latin -ius →