To dumbfound someone is to surprise them so hard that their mind stops for a moment. They may stare, go quiet, or not know what to say.

to dumbfound someone is to surprise them so harddumbfound一個人就是把他嚇到 that their mind stops for a moment讓他的腦袋當機一下 they may stare他們可能會瞪大眼睛 go quiet說不出話 or not know what to say或是不知道該說什麼

It is stronger than surprise and a little more old-fashioned and bookish than shock; in speech people often skip the verb and just say they were dumbfounded. You dumbfound a person — it takes an object — and it is usually about news, a sight, or a fact that does not fit what they expected, not about a small startle.

it is stronger than surprise它比surprise更強烈 and a little more old-fashioned and bookish than shock也比shock更老派、更文謅謅一點 in speech people often skip the verb口語裡大家常常跳過這個動詞 and just say they were dumbfounded直接說they were dumbfounded you dumbfound a person你dumbfound的是一個人 — it takes an object ———它需要接受詞—— and it is usually about news, a sight, or a fact that does not fit what they expected通常是在講一則消息、一個畫面，或一個跟預期不符的事實 not about a small startle而不是在講被小小嚇一跳

Though actually the first piece is an older sense of dumb, ‘unable to speak’, not ‘stupid’: the picture is that the surprise knocks the words out of you.

though actually不過其實 the first piece is an older sense of dumb前半部分dumb是一個較舊的意思 'unable to speak'「不能說話」 not 'stupid'不是「笨」 the picture is that the surprise knocks the words out of you畫面是這個驚訝把你的話都震掉了