Heartiness
Part of speech: noun
Definition: The characteristic of being hearty; fillingness; wholesomeness.
Vigor
Part of speech: noun
Definition: Active strength or force of body or mind; capacity for exertion, physically, intellectually, or morally; energy.
Example sentence: I went in with the youthful vigor that I could single-handedly change the world. But you fast come to the realization that you're 1/435th of one-half of one-third of the government.