passion intensity enthusiasm vehemence fervency fervour fervor emotion fire ardour ardor warmth heat violence passionateness intenseness zeal eagerness spirit excitement zest vigour vigor earnestness energy keenness force gusto feeling devotion animation verve fanaticism avidity fierceness dedication zealousness commitment power assertiveness potency appetite love fury forcefulness impetuosity spiritedness oomph hunger exuberance strength wholeheartedness devotedness fever drive heartiness zing sentiment vivaciousness might rapture fondness thirst lust aggressiveness ferocity relish sincerity vivacity desire impatience vitality readiness urgency welly weakness liveliness alacrity fieriness affection conviction ecstasy purpose depth yen severity inclination longing willingness ferociousness devoutness determination taste piety emphasis wildness dynamism inspiration life agitation