That which, enveloped in darkness, sees ADHARMA as DHARMA, and all things perverted, that intellect (understanding) , O Partha, is TAMASIC (dull) .

adharmaṃ = irreligion; dharmaṃ = religion; iti = thus; yā = which; manyate = thinks; tamasa = by illusion; āvṛtā = covered; sarvārthān = all things; viparītān = in the wrong direction; ca = also; buddhiḥ = intelligence; sā = that; pārtha = O son of Pritha; tāmasī = in the mode of ignorance.;