Where does “dus-” come from?

dus- (Proto-Celtic) comes from Proto-Indo-European dus-, from Proto-Indo-European dēwǝ- — to fail, be behind, be lacking.

dus- (Proto-Celtic): bad

Definitions

Step	Language	Word	Meaning
1	Proto-Indo-European	dus-	bad
2	Proto-Indo-European	dēwǝ-	to fail, be behind, be lacking

dus- — Etymology, Origin & Word History | Etymology Explorer