Where does “vacuitous” come from?

vacuitous (English) comes from Latin vacuus, from Latin -uus, from Proto-Italic *-wos, from Proto-Indo-European -wós — Creates adjectives from verb stems.

vacuitous (English): Lacking thought or intelligence; vacuous

Definitions

Lacking thought or intelligence; vacuous

Ancestry of “vacuitous”, step by step

Step	Language	Word	Meaning
1	Latin	vacuus	empty, vacant, unoccupied; devoid or free of,...
2	Latin	-uus	forms adjectives on verbal stems
3	Proto-Italic	*-wos	—
4	Proto-Indo-European	-wós	Creates adjectives from verb stems

Every word from Proto-Indo-European -wós →Every word from Latin -uus →Every word from Latin vacuus →