enthusiasm

Synonyms: activity ardency ardor avidity conviction craze dash devotion eagerness earnestness ecstasy élan emotion energy exhilaration fad fanaticism feeling fervor fever fieriness fire flame flare frenzy fury gaiety glow go heat hilarity hobby impetuosity intensity interest joy joyfulness keenness life mania mirth nerve oomph orgasm passion pep rapture red heat relish snap spirit transport vehemence verve vim vivacity warmth zeal zealousness zest

Antonyms: aloofness apathy coldness coolness doubt indifference lethargy pessimism weariness