Valmiki Ramayana 6.50.16

भ्रातुः पुत्रेण मे तेन दुष्पुत्रेण दुरात्मना ।राक्षस्या जिह्मया बुद्ध्या चालितावृजुविक्रमौ॥

bhrātuḥ putreṇa me tena duṣputreṇa durātmanā |rākṣasyā jihmayā buddhyā cālitāvṛjuvikramau ||

Our plain-language meaning of this verse is waiting for scholar review.