vociferous adj. + Add to list US //voʊˈsɪfɝəs// UK //vəʊsˈɪfəɹəs// vo·cif·er·ous SynonymsEtymology Synonyms blatantclamantclamorousstridentOriginLATvōcifer→ENvociferous From Latin vōcifer + -ous.