discreditable       
adjective  formal uk/dɪˈskred.ɪ.tə.bəl/ us/dɪˈskred.ə.t̬ə.bəl/
 丧失名誉的,失去信誉的
causing or likely to cause a loss of respect for a person, group, or idea
  Their tactics were highly discreditable. 他们的策略是非常可耻的。 
 Defence lawyers may try to bring up discreditable incidents in the victim's life. 辩护律师可能会试图举出受害者生活中不光彩的事件。 
 See: discredit
 - More examples
 - He certainly did not do anything discreditable.
 - The president was complicit in the whole discreditable affair.
 - The report attempted to conceal anything discreditable to the company.
 - This is one of the more discreditable parts of our history.
 - There is nothing discreditable in the instinct to protect one's family.