1 base, contemptible, despicable, discreditable, disgraceful, ignoble, ignominious, infamous, not cricket (informal) scandalous, shameful
2 blackguardly, corrupt, disreputable, shameless, treacherous, unprincipled, unscrupulous, untrustworthy
English Collins Dictionary - English synonyms & Thesaurus
in AM, use dishonorable Someone who is dishonourable is not honest and does things which you consider to be morally unacceptable. adj
(=disreputable) (Antonym: honourable)
Mark had done nothing dishonourable...
dishonourably adv ADV after v, ADV -ed
He could not bear to be seen to act dishonourably.
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