Definitions:

1. A state of quality of having great enjoyment, excitement, or enthusiasm towards life or a particular activity. NOUN
   • Her zestfulness for adventure led her to explore uncharted territories.
2. The quality or state of being enthusiastic, energetic, and joyfully spirited. NOUN
   • The zestfulness of the children filled the room with laughter and life.

Synonyms:

• enthusiams
• exuberance
• gusto
• liveliness
• spirit
• zest