The word "demoralize" is correct and can be used in written English.
It means to make someone feel less confident, competent, or determined. For example, "The team struggled all season because their coach was too critical and often demoralized the players".
There was something else, besides the progress of the Allies, to demoralize the German commanders the failure and the aftermath of a conspiracy against Hitler.
The purpose of strategic bombing was not only to undermine industrial production but also to demoralize the population.
Such propaganda is generally intended to demoralize the enemy, to break his will to fight or resist, and sometimes to render him favourably disposed to one's position.
Mongol practice, especially in the war against Khwārezm, was to send agents to demoralize and divide the garrison and populace of an enemy city, mixing threats with promises.
Once again, civilians were not killed, but the Union troops did everything they could to demoralize the population and undermine their support for the war.
This use of double agents (or agents provocateurs, as they were often known) did much to demoralize both the revolutionaries and the police and to undermine the reputation of both with the public at large.
The use of atrocities to demoralize enemy populations is an age-old tactic that has never disappeared.
WATSON: I believe that the whalers deliberately took out the Ady Gil to demoralize and dissuade us.
Forbidden to conduct a second march toward Montgomery, King faced an unprecedented dilemma: defy a federal court order and jeopardize Presidential good will, or cancel the march across Pettus Bridge, demoralize thousands of ordinary men and women, and risk vindicating the deep mistrust of the movement's more radical factions, such as the Student Nonviolent Coördinating Committee.
For more than a decade, military censors blocked journalists from reporting on the protocol, apparently because they feared it would demoralize the Israeli public.
Ragweed pollen seed retain their fertilizing qualities for a year and their ability to demoralize an allergic human being for generations.
