她是一名无畏的正义斗士。

She is a ___fearless fighter for justice.

他是那些生活在危险边缘的无畏者之一。

He is one of those ___fearless people who live life on the edge.

要成为一名探险家，你必须无畏地面对未知。

To be an explorer, you must be ___fearless in the face of the unknown.