1) Disgracefully 2) Dishonorably 3) Dishonourably 4) Ignominiously 5) Ingloriously 6) Shamefully 
discreditable, discreditably 1. Bringing shame or dishonor to someone’s good name or reputation. 2. The reverse of creditable; such as to bring discredit; injurious to reputation; disreputable, disgraceful.