dishonorable has 2 distinct synonyms spread across 2 of its 2 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is honorable.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
lacking honor or integrity; deserving dishonor
“dishonorable in thought and deed”
deceptive or fraudulent; disposed to cheat or defraud or deceive
Synonyms, antonyms and the broader and narrower relations for dishonorable come from Princeton University’s WordNet. Full sources and licences.