discriminatory

being biased or having a belief or attitude formed beforehand

• “a prejudiced judge”

containing or implying a slight or showing prejudice

• “discriminatory attitudes and practices”
• “invidious comparisons”

capable of making fine distinctions

manifesting partiality

• “a discriminatory tax”
• “preferential tariff rates”
• “preferential treatment”
• “a preferential shop gives priority or advantage to union members in hiring or promoting”