ebullient
Concise Oxford English Dictionary © 2008 Oxford University Press:
ebullient /ɪˈbʌljənt, -ˈbʊl-/
▶adjective
- 1 cheerful and full of energy.
- 2 archaic (of liquid) boiling or turbulent.
– derivatives
ebullience noun,
ebulliently adverb.
ebullience noun,
ebulliently adverb.
– origin C16: from L. ebullient-, ebullire ‘boil up’.
'ebullient' also found in these Oxford entries:

