dishonourable
dis-hon-our-a-ble
adjective
Lacking honour or integrity; bringing shame or disgrace; morally wrong.
"His actions were truly dishonourable."
Thesaurus
Synonyms: ignominious, opprobrious, degrading, unprincipled, yellow, debasing, disgraceful, shabby, inglorious, shameful, dishonorable, black
Antonyms: honorable, honourable