temerarious

The hiker's temerarious leap across the icy gap stunned the whole group.

用法提示：temerarious 作定语修饰 leap，表示这一跳鲁莽大胆。

It was temerarious of the teenager to challenge the champion to a race.

用法提示：temerarious 作表语，用于 it was + adj. + of sb 结构，形容某人行为胆大妄为。

They called his temerarious proposal to invest all savings in one stock unwise.

用法提示：temerarious 作定语修饰 proposal，说明提议鲁莽冲动。