obscurant — ODE

obscurant /ˈɒbskjʊr(ə)nt

▸ noun

1 a person who deliberately prevents the facts or full details of something from becoming known; an obscurantist:

he is no pious obscurant wishing for a return to the days when issues were never discussed.

2 something used to hinder visibility:

smoke and other obscurants have been used in wars dating back to the ancient Greeks.

▸ adjective

1 deliberately preventing the facts or full details of something from becoming known; obscurantist:

the use of obscurant language.

2 having the effect of hindering visibility:

obscurant clouds.