The practice of deliberately preventing the facts of some subject matter from becoming known. There are two historical and intellectual denotations of Obscurantism:
(1) the deliberate restriction of knowledge—opposition to disseminating knowledge; and,
(2) deliberate obscurity—an abstruse style (as in literature and art) characterized by deliberate vagueness.
Therefore, an obscurantist is someone who actively opposes enlightenment and the consequent social reform, a type of anti-intellectual.