Where does “greușor” come from?

greușor (Romanian) comes from Romanian greu, from Late Latin grevis, from Latin gravis, from Proto-Indo-European gʷréh₂us, from Proto-Indo-European -us — Forms adjectives from Caland system roots.

Ancestry of “greușor”, step by step

Step	Language	Word	Meaning
1	Romanian	greu	heavy; hard, difficult
2	Late Latin	grevis	—
3	Latin	gravis	heavy; troublesome, hard; grave, serious
4	Proto-Indo-European	gʷréh₂us	heavy
5	Proto-Indo-European	-us	Forms adjectives from Caland system roots

Every word from Proto-Indo-European -us →Every word from Proto-Indo-European gʷréh₂us →Every word from Latin gravis →