It is very difficult to express the word 'fail' in this context as one understands the meaning very well but, cannot reply because of the total stupidity of the initial statement. Literally, one is lost for words to do justice to so banal a rendering. My Portuguese is very 'rusty' after some years of non-use. How to render 'rusty'?Also:
Nem sei o que dizer.
Literally true but, does it mean that, in the face of utter idiocy, one is unable to find words to express one's response: ie 'words fail me'?Estou sem palavras!
Thank you. Unfortunately, one understands the words well enough but, the statement is so 'corny' or banal as to defy adequate response. Hence the difficulty with the use, in English, of the word 'fail' in this context, ie I am unable to find words adequately to do justice to so dreadful a pun/joke etc. To put the sense into English is not so easy.Also:
Nem sei o que dizer.
I think your third possibility would 'fit the bill' very well. Obrigado.Algumas frases possíveis, nesse tipo de situação, em contextos informais:
- Sem comentários!
- Nem vou dizer nada...
- Agora você me deixou sem palavras! (irônico)
- Nem vale a pena responder/comentar.
- Nem sei o que dizer. (Joca)