dishonourable Definition

dishonour
dishonor
noun

1a. Shame or loss of honour;

Thesaurus: infamy, disgrace, shame, disfavour, offence, abasement, ignominy, odium, opprobrium; Antonym: honour.
1b. The cause of it.

verb

1. To bring dishonour on someone or something.

Thesaurus: disgrace, shame, discredit, degrade, demean, blacken.
2. To treat someone or something with no respect.
3. commerce.
To refuse to honour (a cheque).

Derivative: dishonourable
adj

Having low moral principles
Thesaurus: corrupt, shameful, contemptible, ignoble, disgraceful, scandalous, infamous, ignominious, despicable, base, shameless, unscrupulous; Antonym: ethical, reputable, trustworthy.

Etymology: 14c: from French deshonneur.