这不是不公平 ,这是嫉妒 翻译成英文

It's not unfair,but jealousy!

楼上两位有个小错误,英语中不能用逗号连接两个句子 要么用分号要么用and

It's not unfairness but jealousy！

英语讲求前后词性相一致。
所以要么都是形容词，要么都是名词，这样最好。

It's not unfair but jealous!

unfair (a.)
jealous (a.)
jealousy (n.)

This is not injustice, but jealousy!

It's not unfair but jealous!

It's not unfair but jealousy!