IPA: //ˈwæɡɪʃnəs//
KK: /ˈwæɡɪʃnəs/
A playful or humorous quality or behavior that is often amusing or entertaining.
His waggishness made the party lively and fun for everyone.
Waggishness → It is formed from "waggish" (from Middle English *wagghish*, meaning playful or jesting) and "-ness" (meaning the state or quality of). The word "waggishness" refers to the quality of being playful or humorous.
Think of someone who is playful and full of jokes — that's what 'waggishness' means, the state of being waggish.