kryptonite
Meaning
Something that severely weakens or incapacitates a person or thing, particularly one that is otherwise formidable or invulnerable.
Origin
The term "kryptonite" explodes from the vibrant pages of DC Comics, deeply embedded in the Superman mythos. First appearing in the Superman radio series in 1943 before making its iconic comic book debut, it refers to radioactive fragments of Superman's home planet, Krypton, which catastrophically exploded and sent these lethal shards hurtling through space. For the Man of Steel, green kryptonite is a debilitating poison, robbing him of his superhuman powers and bringing him to the brink of death—the ultimate paradox for an otherwise invincible hero. This single, critical weakness, unique to Superman, quickly transcended the comic panels, becoming a universally understood metaphor for any powerful entity's lone, overwhelming vulnerability.
Examples
- Despite his tough exterior in the boardroom, public speaking was always his kryptonite, turning him into a nervous wreck.
- Chocolate is my absolute kryptonite; I can never resist a good dark chocolate bar, no matter how full I am.