Added 9 October 2026 sleepwalking noun Categories: ActionsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about sleepwalking at Wordnik → Where our words come from → Walking by a person who is asleep. Related Words: noctambulismsomnambulismaimlesssleepdrivingwakelessnesssomnambulantunsleephalfsleepunconsciousnessdozingslumberlessness Back to today's word