1. cheerful and full of energy: "she sounded ebullient and happy"
2. (of liquid or matter) boiling or agitated as if boiling:archaic"misted and ebullient seas"
Word Originlate 16th century (in the sense ‘boiling’): from Latin ebullient- ‘boiling up’, from the verb ebullire, from e- (variant of ex-) ‘out’ + bullire ‘to boil’.