Valmiki Ramayana 2.7.18

मन्थरा तु वचः श्रुत्वा कैकेय्या मधुराक्षरम् ।उवाच क्रोधसंयुक्ता वाक्यं वाक्यविशारदा॥

mantharā tu vacaḥ śrutvā kaikeyyā madhurākṣaram |uvāca krodhasaṃyuktā vākyaṃ vākyaviśāradā ||

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