galling

/ˈɡɔlɪŋ/
adjective
  1. Causing annoyance, irritation, or resentment because of unfairness or frustration.
    • The long wait for a simple answer was galling to everyone in the office.
    • She found it galling that her coworker received credit for her idea.
    • It was galling to lose the game by just one point after practicing so hard.