Antonyms for Unjust (opposite meaning)
WordNet sense 1 (used especially of what is legally or ethically right or proper or fitting):
justWordNet sense 2 (implying justice dictated by reason, conscience, and a natural sense of what is fair to all):
equitableWordNet sense 3 (free from favoritism or self-interest or bias or deception; or conforming with established standards or rules):
fairFrom the ODE community, based on WordNetadd/edit