unfounded rumor meaning in English

无稽的谣言

Hours after leaving the hospital in july following treatment for fever , he made a decree : " i want to put to rest the speculation and unfounded rumors of my imminent retirement , " he said in a written statement . " i am not about to announce my retirement
今年七月，因发烧而住院接受治疗的伦奎斯特，在出院几小时后，就在一份书面声明中公开宣布： “我想要制止那些有关我即将退休的猜测和没有根据的传言。