Obscurantism.

Noun.

1. Opposition to the spread of knowledge: a policy of withholding knowledge from the general public.

2a. A style (as in literature or art) characterized by deliberate vagueness or abstruseness. b: an act or instance of obscurantism.

-obscurantist noun or adjective. (1834)

“Yes. Because once you get away from the original words, the purest of theories just become rumours. Then we don’t know anything. From one approximation to another inaccuracy, the truth unravels and obscurantism takes over.” – The Ghost Riders of Ordebec, Fred Vargas.