最大的祸害是轻敌，轻敌几乎能断送我的宝贝。

The greatest disaster is to take your rivals lightly; Taking them lightly nearly cost me my treasures.

今日相逢，不可轻敌。

Today we have crossed his path and must not take him lightly.

他后悔我自己过于轻敌了。

He deeply regretted that he had taken the enemy too lightly.