I wouldn't wish something like that on my worst enemy.

即使是我的死对头，我也不想他出那样的事。

It's a horrid experience and I wouldn't wish it on my worst enemy.

这是一次可怕的经历，我甚至不希望它发生在我仇敌的身上。

Your worst enemy is inertia.

你最大的敌人就是惰性。

Good is the worst enemy of best.

优秀是卓越最大的敌人。

YOU are your own worst enemy.

你是你自己最大的敌人。