See flaw in Webster's New World Roget's A-Z Thesaurus II
noun
Something that mars the appearance or causes inadequacy or failure:
blemish, bug, defect, fault, imperfection, shortcoming. See beautiful, better, help
verb
To spoil the soundness or perfection of:
blemish, damage, detract from, disserve, harm, hurt, impair, injure, mar, prejudice, tarnish, vitiate. See better, help
Learn more about flaw