Please translate the given English sentence to Hindi
उनके कट्टर आलोचक उन्हें ‘मौन मोहन सिंह’ कहते रहे पर उन्हें भ्रष्ट प्रधानमंत्री किसी ने नहीं कहा.
His staunchest critics derided him as Maun Mohan Singh but even they could not call him a corrupt prime minister.