wakeful

views updated

wake·ful / ˈwākfəl/ • adj. (of a person) unable or not needing to sleep: he had been wakeful all night. ∎  alert and vigilant. ∎  (of a period of time) passed with little or no sleep: wakeful nights.DERIVATIVES: wake·ful·ly adv.wake·ful·ness n.

More From encyclopedia.com