The constancy because of which a stupid man does not abandon sleep, fear, grief, depression, and also arrogance (conceit) , that fortitude O Partha, is TAMASIC (dull) .

yayā = by which; svapnaṃ = dreaming; bhayaṃ = fearfulness; śokaṃ = lamentation; viṣādaṃ = moroseness; madaṃ = illusion; eva = certainly; ca = also; na = never; vimuñcati = one gives up; durmedhā = unintelligent; dhṛtiḥ = determination; sā = that; pārtha = O son of Pritha; tāmasī = in the mode of ignorance.;