If you say that something or someone is flawless, you mean that they are extremely good and that there are no faults or problems with them. She attributed her flawless complexion to the moisturiser she used Discovery's takeoff this morning from Cape Canaveral was flawless. = perfect + flawlessly flaw·less·ly Each stage of the battle was carried off flawlessly. having no mistakes or marks, or not lacking anything = perfect