To corrupt or undermine the morals of; weaken or destroy the effect of moral principles on.To deprive of spirit or energy; dishearten; destroy the courage, confidence, or hope of; render incapable of brave or energetic effort: specifically used in relation to troops: as, the charge of our cavalry completely demoralized the enemy's left wing.To throw into confusion in general; bring into disorder; confuse mentally: as, he was badly demoralized by fright.Also spelled demoralise.