不公平的英文可以说是"unfair"。来源是源自古英语"un- + fair"，un-表示否定，fair表示公正。例句：

It's unfair that he gets to go to the game and I don't.

The teacher's grading system is unfair to students who try hard but don't do well on tests.

The company's promotion process is unfair to employees who have been with the company for a long time.