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
英英词典释义
Adverb
1. to an undeniable degree or in an undeniable manner;
"she is undeniably the most gifted student in the class"