vehement
Vehement (adj) means expressing very strong feelings in a forceful way.
Etymology
Borrowed either from Middle French vehement (modern French véhément; compare Italian veemente, Portuguese veemente, Spanish vehemente), or from Latin vehemēns (“vehement; very eager; ardent, furious, impetuous; emphatic”), which was probably formed from vē- (“lacking, too little”) and mēns (“mind; intellect; judgment, reasoning”).