kryptonite.
The one weakness of something or someone that is otherwise invulnerable.
Meaning & usage
The one weakness of something or someone that is otherwise invulnerable.
Crack cocaine.
Where this word comes from
From a fictional radioactive element, kryptonite, that has a detrimental effect on the otherwise invulnerable character Superman. Formed from Superman's home planet Krypton + -ite, which was named after the chemical element krypton.
To expose to, or attack with, kryptonite.
To destroy, wreck, or ruin; to affect adversely, as Superman is affected by kryptonite.
Where this word comes from
From a fictional radioactive element, kryptonite, that has a detrimental effect on the otherwise invulnerable character Superman. Formed from Superman's home planet Krypton + -ite, which was named after the chemical element krypton.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.