1. (n.) Drowsy; inclined to, or overcome by, sleep.

2. (n.) Tending to induce sleep; soporiferous; somniferous; as, a sleepy drink or potion.

3. (n.) Dull; lazy; heavy; sluggish.

4. (n.) Characterized by an absence of watchfulness; as, sleepy security.

anesthetized apathetic asleep beat benumbed blase bored boring cataleptic comatose dazed dead debilitated doped dopey dormant dozy dreamy droopy drowsy drugged drugged with sleep dull enervated exanimate exhausted fatigued half asleep heavy heavy with sleep heavy-eyed hebetudinous hypnotic idle in a stupor inactive inanimate inert jaded knocked out lackadaisical languid languorous leaden lethargic lifeless listless lumpish moribund napping narcoleptic narcose narcotic narcotized narcous nodding numb opiate oscitant out out of it passive phlegmatic pooped quiet sated sedated sleep-drowned sleep-drunk sleep-filled sleep-swollen sleepful sleeping slow sluggish slumbering slumberous slumbery snoozy somnifacient somniferous somnolent soporific stagnant stagnating stretchy stultified stuporose stuporous supine tired torpid vegetable vegetative wan weary world-weary yawning yawny