There are various synonyms for the phrase "is unfair" which can be used to express the sentiment of something being unjust, biased or inequitable. Some of the commonly used synonyms for this phrase include unjustified, discriminatory, partial, prejudiced, unethical, unmerited, wrongful, undeserved, unreasonable and inequitable. These synonyms can be applied in various situations such as in employment, education, politics, or any event where there is a perceived or actual unfair treatment of individuals or groups. It's important to use appropriate vocabulary to effectively communicate the extent and severity of the injustices or disadvantages faced by the affected parties.