- overflowing with fervor, enthusiasm, or excitement; high-spirited: The award winner was in an ebullient mood at the dinner in her honor.
- bubbling up like a boiling liquid.
- overflowing with enthusiasm or excitement; exuberant
1590s, “boiling,” from Latin ebullientem (nominative ebulliens), present participle of ebullire “to boil over,” literally and figuratively, from ex- “out” (see ex-) + bullire “to bubble” (see boil (v.)). Figurative sense of “enthusiastic” is first recorded 1660s.