Where does “grave(m)” come from?

grave(m) (Latin) comes from Latin gravis, from Proto-Indo-European gʷréh₂us, from Proto-Indo-European -us — Forms adjectives from Caland system roots.

Ancestry of “grave(m)”, step by step

Step	Language	Word	Meaning
1	Latin	gravis	heavy; troublesome, hard; grave, serious
2	Proto-Indo-European	gʷréh₂us	heavy
3	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 →