Where does “grandiose” come from?

grandiose (French) comes from Italian grandioso, from Italian -oso, from Latin -ōsus, from Old Latin -ōssus.

grandiose (French): grandiose

Definitions

Step	Language	Word	Meaning
1	Italian	grandioso	grandiose, magnificent
2	Italian	-oso	-ous, -ful, -y
3	Latin	-ōsus	—
4	Old Latin	-ōssus	—

grandiose — Etymology, Origin & Word History | Etymology Explorer