Baneful \Bane"ful\, a. Having poisonous qualities; deadly; destructive; injurious; noxious; pernicious. "Baneful hemlock." --Garth. "Baneful wrath." --Chapman. [1913 Webster] -- {Bane"ful*ly}, adv. --{Bane"ful*ness}, n. [1913 Webster]