adjective (a)

• lacking honor or integrity; deserving dishonor(adj.all)

  Example:
  Dishonorable in thought and deed.
  

  Synonym:
  dishonourable
  Antonym:
  honorable, honourable
  

  source: wordnet30
• deceptive or fraudulent; disposed to cheat or defraud or deceive(adj.all)

  Synonym:
  dishonest
  Antonym:
  honest, honorable
  

  source: wordnet30
• Wanting in honor; not honorable; bringing or deserving dishonor; staining the character, and lessening the reputation; shameful; disgraceful; base.(adjective)

  source: webster1913