Source : WordNet®

dishonourable
     adj 1: lacking honor or integrity; deserving dishonor;
            "dishonorable in thought and deed"; "a dishonorable
            discharge" [syn: {dishonorable}] [ant: {honorable}]
     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"
        [syn: {base}, {dishonorable}, {immoral}, {unethical}]
     3: morally unacceptable; "the dishonorable conduct of trusted
        men" [syn: {dishonorable}]