flaw1 / flô/ • n. a mark, fault, or other imperfection that mars a substance or object: plates with flaws in them were sold at the outlet store. ∎ a fault or weakness in a person's character: he had his flaws, but he was still a great teacher. ∎ a mistake or shortcoming in a plan, theory, or legal document that causes it to fail or reduces its effectiveness: there were fundamental flaws in the case for reforming local government.• v. [tr.] (usu. be flawed) (of an imperfection) mar, weaken, or invalidate (something): the computer game was flawed by poor programming.flaw2 • n. poetic/lit. a squall of wind; a short storm.