flaw - definition and synonyms

noun [countable] 

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  1. a mistake or fault in something that makes it useless or less effective

    There are serious flaws in the way we train our teachers.

    fatal flaw (=that makes something completely useless or wrong):

    What you’ve just said is the fatal flaw in your argument.

     Synonyms and related words
     Synonyms and related words
    1. a.
      a mark or fault that spoils something and makes it less beautiful or perfect

      There was a tiny flaw in the diamond.