Where does “frívolo” come from?

frívolo (Spanish) comes from Latin frīvolus, from Proto-Indo-European bʰreyH- — to cut.

frívolo (Spanish): frivolous, flippant

Definitions

Step	Language	Word	Meaning
1	Latin	frīvolus	—
2	Proto-Indo-European	bʰreyH-	to cut

frívolo — Etymology, Origin & Word History | Etymology Explorer