Pronunciation: /ˈkrɪp.tə.naɪt/
noun a mineral or substance that weakens or has a detrimental effect on someone or something, especially a fictional material that is the ultimate weakness of a particular superhero
A1 Superman is weakened by kryptonite.
A2 The superhero's only weakness is kryptonite.
B1 The villain used kryptonite to defeat the hero.
B2 The scientist studied the effects of kryptonite on the superhero.
C1 The discovery of a new type of kryptonite posed a threat to the city.
C2 The superhero's struggle against kryptonite symbolized his internal conflict.
formal Scientists have identified kryptonite as the mineral that weakens Superman's powers.
informal Dude, did you know that kryptonite is like Superman's weakness?
slang That math test was my kryptonite, I totally bombed it.
figurative For many athletes, injuries are their kryptonite, hindering their performance on the field.
weakened
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