WordWeb Online

1. Being unjustly brought into disrepute
   "a discredited politician"
   - damaged
    
2. Suffering shame
   - disgraced, dishonored [US], shamed, dishonoured [Brit, Cdn]

1. Cause to be distrusted or disbelieved
   "The paper discredited the politician with its nasty commentary"
    
2. Damage the reputation of
   "This newspaper story discredits the politicians"
   - disgrace
    
3. Reject as false; refuse to accept
   - disbelieve

See also: ashamed, disreputable

Type of: belittle, brush aside, brush off, discount, dismiss, disparage, disregard, ignore, pick at, push aside, reject