To be mistreated or cheated or to be dejected as a result of such mistreatment. The company paid Steve a generous severance package after firing him, but he still claims he was hard done-by.

To feel mistreated, abused, cheated, or dejected. The company paid Steve a generous severance package after firing him, but he still feels hard done-by. I don't think you have a right to feel hard done-by since you received the same level of assessment as everyone else!