adharmam--irreligion; dharmam--religion; iti--thus; ya--which; manyate--thinks; tamasa--by illusion; avrta--covered; sarva-arthan--all things; viparitan--the wrong direction; ca--also; buddhih--intelligence; sa--that; partha--O son of Prtha; tamasi--the mode of ignorance.

That understanding which considers irreligion to be religion and religion to be irreligion, under the spell of illusion and darkness, and strives always in the wrong direction, O Partha, is in the mode of ignorance.