Refers to a lack of fairness or justice in treatment, rules, or systems. Used as both a noun and a na-adjective.
I think that ruling is unjust.
Unfair transactions are prohibited by law.
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).