Translation

不当に扱われたと感じる / 憤慨した / 被害を受けた

Meaning

Aggrieved describes someone who feels wronged or unfairly treated. It is stronger and more formal than annoyed, and it often implies a grievance, complaint, or claim. Do not confuse it with aggravated, which means made worse or irritated.

Examples

• 不当に解雇された従業員たちは抗議した。
  The aggrieved employees protested the layoffs.
• 彼女はその決定に深く不満を抱いていた。
  She felt deeply aggrieved by the decision.