Synonyms:
* Positive: Thrill, exhilaration, enthusiasm, fervor, elation, rapture, passion, animation, vivacity, zeal
* Negative: Agitation, frenzy, hysteria, fever, commotion
Antonyms:
* Positive: Calm, tranquility, peace, serenity, composure
* Negative: Boredom, apathy, indifference, listlessness, lethargy
The best synonym or antonym to use will depend on the specific context of your sentence.