What would be a suitable synonym for 'ebullient'?

The term 'ebullient' refers to a state of being enthusiastic and overflowing with energy and excitement. A suitable synonym would be one that captures this lively and exuberant spirit. The choice of 'joyful and lively' effectively conveys this meaning, as it reflects the enthusiasm and spiritedness associated with being ebullient.

In contrast, the other options present characteristics that are antithetical to the concept of ebullience. Terms like 'quiet and reserved,' 'serious and somber,' and 'calm and composed' describe temperaments that are more subdued, reflective, or restrained, which do not align with the vibrant and animated essence of ebullient behavior. Thus, the most fitting synonym is 'joyful and lively,' as it encapsulates the energy and enthusiasm inherent in the word ebullient.