impartial (
http://definr.com/impartial)
adj 1: showing lack of favoritism; "the cold neutrality of an
impartial judge" [syn:
fair] [ant:
partial]
2: free from undue bias or preconceived opinions; "an
unprejudiced appraisal of the pros and cons"; "the
impartial eye of a scientist" [syn:
unprejudiced] [ant:
prejudiced]