SLUGGISH Meaning of SLUGGISH in English adj. inert; inactive; slow-moving; torpid; indolent (a sluggish circulation; a sluggish stream). Derivatives: sluggishly adv. sluggishness n. Etymology: ME f. SLUG(1) or slug (v.): see SLUGGARD Oxford English vocab. Оксфордский английский словарь. 2012