話人好大膽英文可以點講ar

bold; confident,boldness; confidence

therefore,you can say :you are so(bold; confident,boldness; confidence)

How dare you !
How dare you call my husband up? 你竟夠膽打電話找我老公？

以上是見到別人做了一些令你不滿或驚訝的事，你說出的反應。
如果只是平白形容一種人，應說：
He / She is very brave.
He / She has guts.（通俗口語化）

You can say,

this person is very brave, OR

this person is very courageous.

very bold

話人好大膽英文可以說Somone has a lot of guts

你可以講話:You are so brave!