The most appropriate antonym of the word impartial is biased.
- Impartial means "not favoring one side or another in a dispute or conflict; fair and just."
- Biased means "having or showing a prejudice in favor of or against one thing, person, or group compared with another, usually in a way considered to be unfair."
The other words do not have the same meaning as impartial, so they are not its antonyms.
- Intellectual means "relating to or involving the intellect; rational or thoughtful."
- Objective means "not influenced by personal feelings or opinions in considering and representing facts."
- Pious means "having or showing a religious or moral belief or feeling."
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