zest
noun
keen relish; hearty enjoyment; gusto.
Used to express actions, events, or states that have not yet occurred but are expected to happen.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Devotion to science will not impair a taste for them, nor will zest for abstract speculations.
From Immortal Memories by Clement King Shorter