Where does “desventajar” come from?

desventajar (Spanish) comes from Spanish desventaja, from Spanish ventaja, from French avantage, from Old French avantage, from Old French avant, from Latin ab ante, from Latin ante, from Ancient Greek κλίσις — Derives abstract/action nouns from verb roots.

Ancestry of “desventajar”, step by step

Step	Language	Word	Meaning
1	Spanish	desventaja	disadvantage, drawback, downside, weakness
2	Spanish	ventaja	advantage, upper hand, edge; benefit; head start
3	French	avantage	advantage
4	Old French	avantage	advantage; profit; gain
5	Old French	avant	beforehand; earlier
6	Latin	ab ante	—
7	Latin	ante	before, in front, forwards; before; before,...
8	Ancient Greek	κλίσις	bending, inclination; a lying down; a place for...
9	Ancient Greek	-σῐς	"suffix forming nouns"
10	Ancient Greek	-τις	Earlier form of -σις , retained after dentals δ,...
11	Proto-Indo-European	-tis	Derives abstract/action nouns from verb roots

Every word from Proto-Indo-European -tis →

desventajar — Etymology, Origin & Word History | Etymology Explorer