If you say that something is undeniable, you mean that it is definitely true.
例句
Her charm is undeniable.她的魅力毋庸置疑。...the undeniable fact that she was driving with almost twice the legal limit of alcohol in her blood.无可否认的事实:她酒后驾车,血液中的酒精含量几乎是法定限量的两倍
英汉词典释义
adj.
无可争辩的;不可否认的;确定无疑的
to an undeniable degree到了不可否认的程度in an undeniable manner以不可否认的方式