If you describe someone as ebullient, you mean that they are lively and full of enthusiasm or excitement about something. [formal]
...the ebullient President.
Synonyms: exuberant, excited, enthusiastic, buoyant
ebullience (ɪbʌliəns , -bʊl- ) uncountable noun His natural ebullience began to return.
Synonyms: exuberance, enthusiasm, excitement, zest