flaw

pluralflaws

noun: a defect, imperfection, or shortcoming in something that makes it less perfect or effective
- The flaw in the plan was not accounting for potential obstacles.
noun: a fault or weakness in a person's character
- His greatest flaw was his inability to admit when he was wrong.
verb: to mark or damage something; to make imperfect
- A single grammatical error can flaw an otherwise perfect argument.