ebullient

the word 'ebullient' originates from the latin verb 'ebullire', which is a compound of 'e-' (a variant of 'ex-', meaning 'out') and 'bullire' (meaning 'to bubble' or 'boil'). this literal sense of bubbling over, like a boiling liquid, was carried directly into english in the early 17th century. over time, the meaning evolved through metaphorical extension, where the vigorous activity of boiling was applied to human emotions and behavior. thus, the modern abstract sense describes a person whose high spirits and enthusiasm seem to bubble over and flow outward, much like a boiling pot.

Structure: e (out) + bulli (boil) + ent (adjective suffix) e- (prefix of latin origin, meaning 'out'); bulli- (stem from latin 'bullire', meaning 'to boil'); -ent (latin adjectival suffix meaning 'being in a state of').