From Longman Dictionary of Contemporary Englishwords fail mewords fail mespokenSAY used to say that you are so surprised, angry, or shocked that you do not know what to say I ... words fail me. → word
Examples from the Corpus
words fail me• Just look at this mess. Look at it. It's...Words fail me!• To get off a train with a total stranger ... I really can not ... well, words fail me. 