/ ɪˈbʌliənt; NAmE ; -ˈbʊl-/ adjective
( formal ) full of confidence, energy and good humour :
The Prime Minister was in ebullient mood.
► ebul·li·ence / -əns; NAmE / noun [ U ]
► ebul·li·ent·ly adverb
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WORD ORIGIN
late 16th cent. (in the sense boiling ): from Latin ebullient- boiling up, from the verb ebullire , from e- (variant of ex- ) out + bullire to boil.