अज्ञानात् this calamity, महात्मनः great soul, तस्य his, यत् that which, मया by me, न गृहीतम् not taken, तत् that, इदम् such, शुभम् auspicious, विभीषणवचः Vibheeshana's words of advice, माम् me, अनुप्राप्तम् not accepted.

"This calamity that has come upon me was because I have not taken such auspicious advice rendered by the great soul Vibheeshana."