silentist
A man of reason who has dedicated his life to the pursuit of the continuing advance of human knowledge... On the most effect way to "Silence" people.
The Nazi silentists were at the cutting edge of research at Auschwitz
Silentistic
A way to explain a quiet person more in detail, not suppose to be a slur or a insult but it may be one is used in context.
This person is silentistic for some reason.