Literature Reference: 无敌于天下者，天吏也。——《孟子·公孙丑上》 He who is invincible under heaven is an officer of heaven. Source from 'Mencius: Gongsun Chou I'.
无: No, it's clean, won't happen.
敌: Adversary, foe.
Meaning: Being invincible signifies unparalleled ability or status, with no rivals.