1. lack of fairness or justice; unfair treatment or situation
2. an unfair act or occurrence

Examples

• The protesters marched against racial injustice in the legal system.
• She felt a deep sense of injustice when her promotion was denied.
• The documentary exposed the injustices faced by migrant workers.
• It would be an injustice to punish the entire class for one student's mistake.
• The judge worked tirelessly to prevent any injustice in his courtroom.
• Many people consider poverty in wealthy nations a grave injustice.