dis·cred·it·able /-təbəl/
  (a.)失信用的,不名譽的,恥辱的
  dis·cred·it·a·ble a. Not creditable; injurious to reputation; disgraceful; disreputable. -- Dis*cred*it*a*bly, adv.
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  discreditable
       adj : tending to bring discredit or disrepute; blameworthy; "his
             marks were not at all discreditable"