undeˈfending,ppl.a. (un-1 10.) 1651Jer. Taylor Serm. for Year I. xx. 253 Birds, sheep, and bevers, who..have not the foresight to avoid a snare, but by their fear and undefending follies are driven thither.1888O. Crawfurd Sylvia Arden 329 Having to slay an undefending man in cold blood.