SLUGGISH Meaning of SLUGGISH in English ■ adjective slow-moving or inactive. ↘lacking energy or alertness.Derivatives~ly adverb~ness noun OriginME: from the noun slug 1 or the verb slug (see sluggard ) + -ish 1 . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004