Weaknesses And Vulnerabilities

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

• Scientists have identified kryptonite as the mineral that weakens Superman's powers.
• Dude, did you know that kryptonite is like Superman's weakness?
• That math test was my kryptonite, I totally bombed it.
• For many athletes, injuries are their kryptonite, hindering their performance on the field.

noun Achilles' heel - a weakness or vulnerable point in someone or something

• The lack of proper cybersecurity measures is often considered the company's Achilles' heel.
• His Achilles' heel is definitely his love for junk food.
• She knows that her fear of public speaking is her Achilles' heel.
• Procrastination is my Achilles' heel when it comes to meeting deadlines.