FATUOUS Meaning of FATUOUS in English [ 'fatjʊəs ]■ adjective silly and pointless.Derivativesfatuity noun ( plural fatuities ). ~ly adverb~ness noun OriginC17: from L. fatuus 'foolish' + -ous . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004