ERRONEOUS Meaning of ERRONEOUS in English [ ɪ'rəʊnɪəs , ɛ- ]■ adjective wrong; incorrect.Derivatives~ly adverb~ness noun OriginME: from L. erroneus (from erro(n-) 'vagabond', from errare 'to stray, err') + -ous . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004