निर्घृणः pitiless, त्वम् you, महात्मनः of the noble, तस्य his, ईदृशम् such, अलीकम् deceiving, कृत्वा after doing, विषम् poison, पीत्वेव as if after drinking, चिरम् for long, धरितुम् to survive, न शक्ष्यसि not possible.

You are pitiless. You will not be able to survive for long after deceiving such noble Rama just as man cannot survive after drinking poison.