- 1a mistake in something that means that it is not correct or does not work correctly synonym defect, fault The argument is full of fundamental flaws. flaw in something The report reveals fatal flaws in security at the airport. There is still a basic flaw in your selection procedure.
- 2flaw (in something) a crack or fault in something that makes it less attractive or valuable The vase is in excellent condition except for a few small flaws in its base.
- 3flaw (in somebody/something) a weakness in someone's character There is always a flaw in the character of a tragic hero.