vidveṣa-naṣṭa-matayaḥ - whose intelligence was lost in envy; striyaḥ - the women; dāruṇa-cetasaḥ - being very hardhearted; garam - poison; daduḥ - administered; kumārāya - unto the boy; durmarṣāḥ - being intolerant; nṛpatim - the King; prati - upon.

As their envy increased, they lost their intelligence. Being extremely hardhearted and unable to tolerate the King’s neglect, they finally administered poison to the son.