The Word 'ZEAL'

Zeal (noun)

definition:
prompt willingness

example:
"Your zeal for the task was apparent in the way you promptly volunteered."

Zeal (noun)

definition:
excessive fervor to do something or accomplish some end

example:
"I have an absolute zeal for litigation."

Zeal (noun)

definition:
a feeling of strong eagerness, usually in favor of a person or cause

example:
"How dare you question my zeal for the cause?"