Where does “brutal” come from?

brutal (Bikol Central) comes from Spanish brutal, from Medieval Latin brutalis, from Latin brūtus, from Proto-Indo-European gʷréh₂us, from Proto-Indo-European -us — Forms adjectives from Caland system roots.

Ancestry of “brutal”, step by step

Step	Language	Word	Meaning
1	Spanish	brutal	brutal
2	Medieval Latin	brutalis	savage, stupid
3	Latin	brūtus	—
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 brūtus →