verb (v)

• corrupt morally or by intemperance or sensuality(verb.social)

  Synonym:
  corrupt, debase, debauch, demoralise, deprave, misdirect, pervert, profane, subvert, vitiate
  

  source: wordnet30
• lower someone's spirits; make downhearted(verb.emotion)

  Example:
  The bad state of her child's health demoralizes her.
  

  Synonym:
  cast down, deject, demoralise, depress, dismay, dispirit, get down
  Antonym:
  elate, intoxicate, lift up, pick up, uplift
  

  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)

  source: webster1913