Meaning

adjective not disposed to cheat or defraud; not deceptive or fraudulent

adjective worthy of being honored; entitled to honor and respect

adjective adhering to ethical and moral principles

originFrom Middle English honourable, from Old French honorable, honurable, from Latin honōrābilis, from honōrō (“to honour”); cognate with Italian onorabile, Spanish honorable. By surface analysis, honor + -able. In this sense, largely displaced Old English ārfæst.

Etymology from Wiktionary, CC BY-SA 3.0