The company indeed was perfectly assorted, since all the members belonged to the little inner group of people who, during the long New York season, disported themselves together daily and nightly with apparently undiminished zest.
There are no more uses of "zest" in the book.
Show samples from other sources
If you didn’t know her, you’d think her zest comes from malice.
Susan Ee -- Angelfall
Kit chose the stories she herself enjoyed most, and her reading had a zest and liveliness that enthralled the children.
Elizabeth George Speare -- The Witch of Blackbird Pond