Shameful or deserving of disgrace; showing a lack of honesty, integrity, or good character.
From Old French 'deshonorer' (dis- 'opposite of' + honor). The adjective form added the suffix '-able' to describe something capable of bringing dishonor or worthy of disgrace.
In military law, 'dishonorable discharge' is the worst punishment a soldier can receive—it's worse than prison because it permanently marks someone as untrustworthy and removes most of their civilian rights, reflecting how seriously societies take personal honor.
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