Refers to a lack of fairness or justice in treatment, rules, or systems. Used as both a noun and a na-adjective.
その判決は不公正だと思う。
I think that ruling is unjust.
不公正な取引は法律で禁じられている。
Unfair transactions are prohibited by law.
不公正 is a more formal, often legal or systemic term for unfairness, while 不公平 is the everyday word for feeling treated unfairly.
不公正 describes an unfair or biased state, the direct opposite of 公正's impartial fairness.
unfair business practice
Formed from 不 (prefix meaning 'not') + 公正 (fairness, justice).