IPA: /vɪˈveɪʃəsnəs/
KK: /vɪˈveɪʃəsnəs/
The quality of being lively, energetic, and full of enthusiasm.
Her vivaciousness made the party much more enjoyable for everyone.
Vivaciousness → It is formed from "vivax" (from Latin, meaning lively or full of life) and the suffix "-ness" (meaning the state or quality of). The word "vivaciousness" refers to the quality of being lively and animated.
Think of 'lively' ('vivax') to remember that 'vivaciousness' means the quality of being full of life and energy.