The word "unfair" describes a situation or action that is not just, equitable, or impartial. It refers to circumstances where one party is treated better or worse than others, leading to inequality or injustice. Essentially, something is considered unfair when it does not adhere to principles of fairness and impartiality.
The word "unfair" is a combination of the prefix "un-" meaning "not" and the word "fair," which comes from Old English "fæger," meaning pleasing, attractive, or morally good. The current usage dates back to the 14th century.