C1 adjective /ɔːˈdeɪ.ʃəs/
Audacious
大胆
Meaning
showing willingness to take bold risks; daring
Example
His audacious plan to climb the mountain without proper equipment shocked everyone.
他毫不犹豫地提出了一个大胆的计划,要在没有适当设备的情况下攀登这座山,令所有人震惊。