Flawless is an adjective that means "without any imperfections," like your flawless vocal performance — not one mistake. That's why the choir teacher gave you an A+. In flawless you can see the word flaw, which means "a fault." So something that is flawless is free of faults, perfect.

Is there a word flawlessness?

adj. Being entirely without flaw or imperfection. See Synonyms at perfect. flaw′less·ly adv.

What is flawlessness?

Definitions of flawlessness. the state of being without a flaw or defect. synonyms: ne plus ultra, perfection. Antonyms: imperfection, imperfectness. the state or an instance of being imperfect.