Jurate Gacionyte asleep a· sleep [uh-sleep] –adverb 1. in or into a state of sleep: He fell asleep quickly. 2. into a dormant or inactive state; to rest: Their anxieties were put asleep. 3. into the state of death. –adjective 4. sleeping: He is asleep. 5. dormant; inactive. a home a b c d e f g h i j k l m n o p q r s t u v w x y z ascent asleep assassin astray atmosphere autumn avert away