Where does “gelosissimo” come from?

gelosissimo (Italian) comes from Italian geloso, from Latin zēlōsus, from Latin zēlus, from Ancient Greek Ζῆλος, from Proto-Indo-European yeh₂- — to go; to go in, enter; to ride, to travel.

Ancestry of “gelosissimo”, step by step

Step	Language	Word	Meaning
1	Italian	geloso	jealous
2	Latin	zēlōsus	jealous
3	Latin	zēlus	zeal, emulation
4	Ancient Greek	Ζῆλος	Zelus
5	Proto-Indo-European	yeh₂-	to go; to go in, enter; to ride, to travel

Every word from Proto-Indo-European yeh₂- →Every word from Ancient Greek Ζῆλος →Every word from Latin zēlus →