sleep·y / ˈslēpē/ • adj. (sleep·i·er, sleep·i·est) needing or ready for sleep: the wine had made her sleepy. ∎ showing the effects of sleep: she rubbed her sleepy eyes. ∎ inducing sleep; soporific: the sleepy heat of the afternoon. ∎ (of a place) without much activity: he turned off the road into a sleepy little town. ∎ (of a business, organization, or industry) lacking the ability or will to respond to change; not dynamic: it was once a sleepy subsidiary of Foster & Sykes.DERIVATIVES: sleep·i·ly / ˈslēpəlē/ adv.sleep·i·ness n.