excessive fervor to do something or accomplish some end
"he had an absolute zeal for litigation"
prompt willingness
"readiness to continue discussions"
"they showed no eagerness to spread the gospel"
"they disliked his zeal in demonstrating his superiority"
"he tried to explain his forwardness in battle"
The fervour or tireless devotion for a person, cause, or ideal and determination in its furtherance; diligent enthusiasm; powerful interest.
"Her zeal for environmental conservation drove her to organize community cleanups every single weekend without complaint."
The word zeal comes from the Ancient Greek zêlos, which originally meant "zeal" or "jealousy." It ultimately traces back to a Proto-Indo-European root meaning "to search," making it related to the word jealous.