zeal
n. uncountablen. a lot of energy and excitement for a cause or an activity. You show this when you work very hard because you believe in what you are doing.
n. great energy or enthusiasm in pursuit of a cause or an objective. Often carries a connotation of intense, almost religious devotion to a task.
She started her new job with great zeal.
The young activists campaigned with such zeal that they managed to register thousands of new voters in just one week.
While his reformist zeal was initially welcomed by the board, his refusal to compromise on minor procedural details eventually alienated his most loyal supporters.
From Middle English zele, from Old French zel, from Late Latin zēlus, from Ancient Greek ζῆλος (zêlos, “zeal, jealousy”), from Proto-Indo-European *yeh₂- (“to search”). Related to jealous.
Commonly paired with the preposition 'for' ('zeal for justice').