effervescent adj. + Add to list US //ˌɛfɝˈvɛsənt// UK //ˌɛfəvˈɛsənt// ef·fer·ves·cent SynonymsAntonymsEtymology Synonyms bubblingfrothyscintillatingsparklingsparkly Antonyms noneffervescentstillOriginFRAeffervescent→ENeffervescent From French effervescent, from Latin effervēscō (“boil up”).