Example: The bad state of her child's health demoralizes her.
source: wordnet30
confuse or put into disorder(verb.cognition)
Example: The boss's behavior demoralized everyone in the office.
source: wordnet30
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.(verb)