If you're in a contest, you'd better hope the judges are impartial. That means that they aren't biased toward one competitor over another.

If you’re partial to the color green, you love green and wear it all the time. If you’re impartial to colors, you don’t care what color you wear. To be impartial is to be objective, so you don’t mind one way or another how something is going to turn out. It’s important for jurors to be impartial when reaching a verdict, rather than allowing biases and preconceptions affect their judgment.

Definitions of impartial

adj free from undue bias or preconceived opinions

“the impartial eye of a scientist”
color-blind, colour-blind, nonracist
unprejudiced about race
open, receptive
ready or willing to receive favorably
discriminatory, prejudiced
being biased or having a belief or attitude formed beforehand
prejudiced against homosexual people
showing or affected by prejudice or envy or distaste
(of statements or questions) charged with associative significance and often meant to mislead or influence
anti-Semite, antiblack, racist
discriminatory especially on the basis of race or religion
discriminatory on the basis of sex (usually said of men's attitude toward women)
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adj showing lack of favoritism

“the cold neutrality of an impartial judge”
fair, just
free from favoritism or self-interest or bias or deception; conforming with established standards or rules
unaffected by self-interest
cold-eyed, dispassionate
unaffected by strong emotion or prejudice
indifferent, unbiased, unbiassed
characterized by a lack of partiality
marked by no especial liking or dislike or preference for one thing over another
showing favoritism
unfair, unjust
not fair; marked by injustice or partiality or deception
biased, colored, coloured, one-sided, skewed, slanted
favoring one person or side over another
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