IMPARTIAL

adj. unbiased, objective, unprejudiced, fair

Impartiality is a principle of justice holding that decisions should be based on objective criteria, rather than on the basis of bias, prejudice, or preferring the benefit to one person over another for improper reasons.
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Adjective
1. showing lack of favoritism; "the cold neutrality of an impartial judge"
(synonym) fair
(antonym) partial, unfair
(similar) disinterested
(see-also) fair, just
2. free from undue bias or preconceived opinions; "an unprejudiced appraisal of the pros and cons"; "the impartial eye of a scientist"
(synonym) unprejudiced
(similar) color-blind, colour-blind, nonracist

adj. impartial, unbiased, unprejudiced, objective; dispassionate, even minded, indifferent

(a.)
Not partial; not favoring one more than another; treating all alike; unprejudiced; unbiased; disinterested; equitable; fair; just.