To corrupt or undermine in morals; to destroy or lessen the effect of moral principles on; to render corrupt or untrustworthy in morals, in discipline, in courage, spirit, etc.; to weaken in spirit or efficiency.
demoralize in German is demoralisere, demoralisieren
demoralize in Italian is scoraggiare
demoralize in Spanish is desmoralizar, desanimar
demoralize in Swedish is demoralisera