that's unfairUsed to say that something is unfair or unjust. 不公平 is followed by だ in plain speech; it can also be softened or made into a question with forms such as 不公平じゃない? or 不公平だろ?.
JA: 一人だけ働くのは不公平だ。
EN: It's unfair for only one person to do the work.