zestfulnesshttp://www.oed.com/dictionary/zestfulness_n%3Ftab%3Dmeaning_and_usezestfulness, n.
Revised 2018

zestfulnessnoun

  1. 1850–
    Stressed as ˈzestfulness.
    1. 1850
      What zestfulness in that expression.
      Westminster Review April 328
    2. 1914
      She realized..a zestfulness she had never known in her former conquests.
      K. E. Oliver, Claw xviii. 156
    3. 2005
      You can just tell, from the sheer zestfulness of the painting, that he's on his knees learning from them.
      Times 29 November ii. 23/3

Originally published as part of the entry for zestful, adj.

zestful, adj. was revised in June 2018.