expression, i-adjective
astonished beyond words; speechless out of shock
Used when someone is so shocked, appalled, or dumbfounded that they cannot speak. Often carries a nuance of exasperation or disbelief at someone's actions.
See also: ものが言えない (ものがいえない)
彼のあまりに失礼な態度に、呆れてものが言えなかった。
I was so appalled by his incredibly rude attitude that I was speechless.
その言い訳には呆れてものが言えないよ。
That excuse leaves me so dumbfounded I can't even speak.