Ebullient means overflowing with cheerful energy. In ebullient mood, an ebullient welcome, ebullient about the result.
The Latin behind it is boiling, so the picture is of high spirits bubbling over rather than merely being present. It suits a mood or a manner and is faintly excessive, which is part of its charm.
1adjectiveebullientOverflowing with cheerful energy.
“He came off the pitch ebullient and shouting.”
ebullient is a quality.
Latin ebulliens is the present participle of ebullire, to boil up, from bullire, to bubble.
Latin
ēbulliēns
English, today
ebullient
Built from
Borrowing from Latin ēbulliēns, present participle of ēbulliō (“to boil”), from bulliō (“to bubble up”) (English boil). Compare bubbling, bubbly, and perky, which use a similar metaphor.
Etymology from Wiktionary, CC BY-SA