IPA: /ˈprɪtɪnəs/
KK: /ˈprɪtɪnəs/
The quality of being attractive or pleasing in appearance.
The prettiness of the flowers made the garden look beautiful.
Prettiness → It is formed from "pretty" (from Middle English *prity*, meaning attractive or pleasing) and "-ness" (meaning the state or quality of). The word "prettiness" refers to the state of being pretty or attractive.
Think of the word 'pretty' which means attractive, and remember that 'prettiness' describes the quality of being attractive.