Someone who is dishonourable is not honest and does things which you consider to be morally unacceptable.
例句
Mark had done nothing dishonourable...马克没有做任何不光彩的事。He was not a dishonourable man, he was merely a professional.他不是个不知羞耻的人,他只是个专业人士。
英英词典释义
Adjective
1. lacking honor or integrity; deserving dishonor;
"dishonorable in thought and deed""a dishonorable discharge"
2. not adhering to ethical or moral principles;
"base and unpatriotic motives""a base, degrading way of life""cheating is dishonorable""they considered colonialism immoral""unethical practices in handling public funds"