noun 1.the quality of being
vehement; ardor; fervor.
2.vigorous impetuosity; fury: the vehemence of his attack.
Also, ve·he·men·cy.
Related forms o·ver·ve·he·mence, noun
Synonyms
1. eagerness, verve, zeal, enthusiasm, fervency. 2. passion.
Antonyms
1, 2. apathy.