Valmiki Ramayana Yuddha Kanda Sarga 106 Shloka 10
Original Shlokaएवंपुरुषमुक्तस्तुहितबुद्धिबुद्धिना । अब्रवीद्रावणंसूतोहितंसानुनयंवचः ।।6.106.10।।
1 source checked for this shloka
अबुद्धिना insensitive, एवम् in that way, परुषम् harsh, उक्तः spoken, हितबुद्धि: beneficial advice, सूतः charioteer, रावणम् to Ravana, सानुनयम् friendly, वचः words, अब्रवीत् spoke
When the insensitive Ravana spoke harshly in that manner, to the charioteer who was wishing his benefit, he spoke in friendly language to Ravana.