गमिष्यन् to depart, सः वानरः that vanara, तया by her, प्रशस्ताभिः with choicest, वाग्भिः with words, पूजितः honoured, तस्मात् from that, देशात् from location, अपक्रम्य moved, चिन्तयामास started thinking.

Having been honoured and praised by Sita's words, Hanuman prepared to depart from Sita's presence. Hanuman decides to meet Ravana and measure his strength