WordWeb Online

1. Made less hopeful or enthusiastic
   - demoralized, discouraged, disheartened

1. Corrupt morally or by intemperance or sensuality
   - corrupt, pervert, subvert, demoralize, debauch, debase, profane, vitiate, deprave, misdirect
    
2. Lower someone's spirits; make downhearted
   - 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

See also: demoralisation [Brit], pessimistic

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