That by which one wrongly understands DHARMA and ADHARMA and also what ought to be done and what ought not to be done, that intellect (understanding) , O Partha, is RAJASIC (passionate) .

yayā = by which; dharmaṃ = the principles of religion; adharmaṃ = irreligion; ca = and; kāryaṃ = what ought to be done; ca = also; akāryaṃ = what ought not to be done; eva = certainly; ca = also; ayathāvat = imperfectly; prajānāti = knows; buddhiḥ = intelligence; sā = that; pārtha = O son of Pritha; rājasī = in the mode of passion.;