rambunctious adj. + Add to list US //ɹæmˈbəŋkʃəs// UK //ɹæmbˈʌŋkʃəs// ram·bunc·tious Informal SynonymsEtymology Synonyms boisterousrobustiousrumbustiousunrulyOrigin A variant of rumbustious (“boisterous and unruly”).