无语用英语怎么说

1. 无语用英语怎么说？ How do you say "speechless" in English?

2. 我对他的行为感到无语。 I am speechless about his behavior.

3. 这个问题让我感到无语。 This question leaves me speechless.

4. 他的回答让我无语。 His response left me speechless.

5. 我不知道该说什么了，只能无语了。 I don't know what to say, I am just speechless.