It was unfair for the boss to give larger bonuses to his friends.
Syn: biased, cheating, discriminatory, dishonest, dishonorable, disproportionate, excessive, foul, inequitable, invidious, partial, prejudiced, underhanded, unequal, unethical, uneven, unfavorable, unjust, unjustified, unwarranted, wrong, wrongful
Wikipedia foundation.