As this illustration shows, it is now man that is man's worst enemy

正如这幅插图所示，现在人类才是人类最大的敌人。

youdao

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。

《牛津词典》

Your worst enemy is inertia.

你最大的敌人就是惰性。

youdao

Dean Fidelman said that he believes a climber's ego can be his worst enemy on a rock.

VOA: special.2009.12.09

She says knowledge about the world's healthiest diets has become more available than ever and can help us fight our worst enemy: obesity.

VOA: standard.2010.02.23

Because smart women (in their youth, bright girls) are often their own worst enemy.

FORBES: Bright Girls, Smart Women: Often Their Own Worst Enemies

In other words, the PTO is forcing the patent owner to become his own worst enemy.

FORBES: New Patent Regs May Inspire More Litigation, Not Less

Indiana has become its own worst enemy, producing more stars than its flagship school can retain.

WSJ: Indiana vs. Michigan: Indiana Faces Off Against...Indiana