1 : a small physical problem (such as a crack) that makes something less valuable : defect
There was a flaw in the vase.
He inspected the fabric for flaws.
2 : a small fault or weakness
Several critics pointed out the flaws in the book’s plot.
Vanity was the one flaw in his character.
There are a few flaws in your argument.
— flawless ˈflɑ:ləs adjective
an attractive woman with flawless skin
a flawless [=perfect] performance
— flawlessly adverb
She performed flawlessly.
— flawlessness noun [noncount]