GRUESOME Meaning of GRUESOME in English ■ adjective causing repulsion or horror. ↘ informal very unpleasant.Derivatives~ly adverb~ness noun OriginC16: from Sc. grue 'feel horror, shudder' (of Scand. origin) + -some 1 . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004