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.
"people can be demoralised at times."
"fighters can be demoralised to radicals."
"fighters can be demoralised by losses."
"armies can be demoralised."
"forces can be demoralised."
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