Pronunciation: (di-môr'u-līz", -mor'-),[key] —v.t.,-ized, -iz•ing. 1. to deprive (a person or persons) of spirit, courage, discipline, etc.; destroy the morale of: The continuous barrage demoralized the infantry. 2. to throw (a person) into disorder or confusion; bewilder: We were so demoralized by that one wrong turn that we were lost for hours. 3. to corrupt or undermine the morals of. Also,esp. Brit.,de•mor'al•ise".