General Synonyms:
* Enthusiastic
* Ebullient
* Effervescent
* Vivacious
* Jovial
* Buoyant
* Lively
* Animated
* High-spirited
* Cheerful
More specific synonyms:
* Rhapsodic (if referring to a passionate expression)
* Profuse (if referring to abundance)
* Overjoyed (if referring to extreme happiness)
* Thriving (if referring to flourishing growth)
* Opulent (if referring to lavishness)
The best synonym for "exuberant" will depend on the context of your writing. Consider the specific meaning you want to convey and choose the word that best fits your needs.