WordWeb Online

1. Corrupt morally or by intemperance or sensuality
   "Socrates was accused of demoralising young men"
   - corrupt, pervert, subvert, demoralize, debauch, debase, profane, vitiate, deprave, misdirect
    
2. Lower someone's spirits; make downhearted
   "These news demoralised her"
   - depress, deject, cast down, get down, dismay, dispirit, demoralize
    
3. Confuse or put into disorder
   "the boss's behaviour demoralised everyone in the office"
   - demoralize

Derived forms: demoralised, demoralises, demoralising

See also: demoralisation [Brit]

Type of: alter, bedevil, befuddle, change, confound, confuse, discombobulate, discourage, fox, fuddle, modify, throw