IPA: /ˈlaɪv.lɪ.nəs/
KK: /ˈlaɪv.lɪ.nəs/
The quality of being full of life and energy; being active and cheerful.
The liveliness of the children made the party very enjoyable.
Liveliness → It is formed from "live" (from Old English "libban", meaning to be alive) and "-ness" (a suffix meaning the state or quality of). The word "liveliness" refers to the state of being full of life or energy.
Think of the word 'live' which means to be alive, and remember that 'liveliness' describes the quality of being full of life and energy.