IPA: /ˈflɔːləsnəs/
KK: /ˈflɔːləsnəs/
The state of being perfect or without any mistakes or defects.
The flawlessness of her performance impressed everyone in the audience.
Flawlessness is formed from "flaw" (from Old English *flāw*, meaning a defect or imperfection) and "-lessness" (meaning without). The word describes the state of being without any defects or imperfections.
Think of 'flaw' as a defect and '-lessness' meaning without — so flawlessness means being without any defects.