O.E. bealu-full, from bealu "harm, injury, ruin, evil, mischief, wickedness, a noxious thing," from P.Gmc. *balwom (cf. O.S. balu, O.Fris. balu "evil," O.H.G. balo "destruction," O.N. bol, Gothic balwjan "to torment"), from PIE base *bheleu- "to beat." During Anglo-Saxon times, in poetic use only (e.g. bealubenn "mortal wound," bealuðonc "evil thought"), and for long it was extinct, but revived by modern romantic poets.