Dishonorably

[dɪs'ɑnərəbli]

(adv.) with dishonor; 'he was dishonorably discharged'.

(adv.) in a dishonorable manner; 'he acted dishonorably'.

Checker: Pamela--From WordNet

You are astonished at my thus acting so dishonorably. Fergus Hume. The Island of Fantasy.
I believed that he had never acted dishonorably, and I begged him to tell me the history. George Eliot. Middlemarch.

Checker: Pamela