Prefix with "loyal" (3)

I believe the answer is:
dis
(Other definitions for dis that I've seen before include "Greek underworld" , "Roman god of the underworld" , "The god Pluto" , "Be rude" , "Treat without respect - god of the underworld" .)
I believe the answer is:
dis
(Other definitions for dis that I've seen before include "Greek underworld" , "Roman god of the underworld" , "The god Pluto" , "Be rude" , "Treat without respect - god of the underworld" .)