Is it ensure, insure, or assure?
Old English druncennysse; see drunken + -ness.
full form of the past participle of drunk. Meaning "inebriated" was in Old English druncena; adjectival meaning "habitually intoxicated" is from 1540s. Related: Drunkenly.
drunkenness drunk·en·ness (drŭng'kə-nĭs)n. The condition of being delirious with or as if with alcohol; intoxicated.