1 detract, disparage, defame, dishonour, disgrace, degrade, bring into disfavour or disrepute, deprecate, demean, lower, devalue, depreciate, devaluate, belittle, diminish, reduce; slur, slander, vilify, calumniate, sully, smear, blacken, taint, tarnish, besmirch, smirch, stigmatize, asperse, malign, libel:
Both of them were thoroughly discredited by the scandal.
2 disbelieve, deny, dispute, doubt, question, raise doubts about, distrust, mistrust, give no credit or credence to:
As he's a known liar, you can discredit whatever he tells you.
3 disprove, reject, refute, invalidate; mock, ridicule:
The phlogiston theory is generally discredited by most modern chemists.
4 dishonour, degradation, disfavour, disrepute, ill repute, disgrace, ignominy, infamy, odium, stigma, shame, smear, slur, scandal, obloquy, opprobrium, humiliation:
Her performance has brought discredit to all female saxophonists.
5 damage, harm, reflection, slur, aspersion, slander, defamation, blot, brand, tarnish, blemish, taint:
The discredit to her reputation is irreparable.
6 doubt, scepticism, dubiousness, doubtfulness, qualm, scruple, question, incredulity, suspicion, distrust, mistrust:
The new evidence throws discredit on the validity of the previous testimony.