Englishvehemence
noun
the vehemence of her answer surprised both of them:
passion, force, forcefulness, ardour, fervour, spirit, spiritedness, urgency, strength, forcibleness, emphasis, vigour, intensity, violence, earnestness, eagerness, keenness, enthusiasm, zeal, zealousness, fanaticism;
vociferousness, outspokenness, forthrightness, insistence.
▷antonyms mildness, apathy.
vehemence Oxford Dictionary of English