ebullient
adj. US //ˌɪˈbəɫjənt// UK //ɪbˈʊliənt// ebul·lient
Borrowing from Latin ēbulliēns, present participle of ēbulliō (“I boil”), from bulliō (“I bubble up”) (English boil). Compare bubbling, bubbly, and perky, which use a similar metaphor.