Sechel

Sechel was a non-Force-sensitive male Pureblood Sith who served as an advisor and envoy of the Dark Councilor Darth Nyriss of the reconstituted Sith Empire, and previously served in the Imperial Intelligence. Despite not being Force-sensitive, his intelligence and highly developed survival skills compensated for this and his underwhelming stature, which allowed him to rise high in Sith society.

Within Sith society purebloods that didn't have a connection to the Force where seen as lesser, even being called things such as an 'abomination', as Scourge commented on.

Text and facts from the “Sechel” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.