SEDULOUS Meaning of SEDULOUS in English [ 'sɛdjʊləs ]■ adjective showing dedication and diligence.Derivativessedulity sɪ'dju:lɪti noun~ly adverb~ness noun OriginC16: from L. sedulus 'zealous' + -ous . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004