STEADFAST Meaning of STEADFAST in English [ 'stɛdfα:st , -fəst ]■ adjective resolutely or dutifully firm and unwavering.Derivatives~ly adverb~ness noun OriginOE stedefæst 'standing firm' (see stead , fast 1 ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004