Where does “impromutuare” come from?

impromutuare (Vulgar Latin) comes from Latin promutuari, from Latin promutuor, from Latin promutuum, from Latin promutuus, from Latin mūtuus, from Latin muto, from Latin -ium, from Latin -ius — Creates adjectives from noun or verb stems.

Ancestry of “impromutuare”, step by step

Step	Language	Word	Meaning
1	Latin	promutuari	present active infinitive of prōmūtuor
2	Latin	promutuor	I lend beforehand
3	Latin	promutuum	an advance, loan
4	Latin	promutuus	paid beforehand; advanced, lent in advance
5	Latin	mūtuus	—
6	Latin	muto	I move, remove; I alter, change, modify,...
7	Latin	-ium	Suffix used to form abstract nouns, sometimes...
8	Latin	-ius	forming adjectives from nouns; nominative neuter...
9	Proto-Italic	-jōs	Forms comparative adjectives
10	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Every word from Proto-Indo-European -yós →