a blemish or imperfection
a usu hidden defect, e.g. a crack, that may cause failure under stress
a flaw in a bar of steel
a weakness in reasoning, etc
a flaw in his argument
a fault in a legal paper that may invalidate it
flawless adj
flawlessly adv
flawlessness noun
[Middle English, in the sense ‘snowflake, splinter’, prob of Scandinavian origin]