fair
Gerrymandering is not fair, unless you consider fair to mean 'fair game' in the sense that it is not illegal everywhere.
It is unfair.
unfair
The killing of animals can be fair or unfair. If the killing is for food or for protection it is fair.
It is fair
unfair
There is no other better way to learn about gerrymandering is to join the political parties and become a campaigner. It is a means to try an obtain a political advantage by unfair measures.
Unfair
Fair, just, honest, unprejudiced...The opposite of unfair is fair.
The word 'unfair' is an adjective meaning 'not fair.' Examples: We thought that the principal's new rule was unfair. The company was accused of unfair labor practices.
unfair
Unfair if you were found guilty due to dodgy evidence.