Synonyms to unbiased observer

arbiter, JP, Justice, amateur, arbiter elegantiarum, arbiter of taste, arbitrator, authority, bencher, bon vivant, cognoscente, collector, connaisseur, connoisseur, critic, dilettante, epicure, epicurean, expert, good judge, gourmand, gourmet, his honor, his lordship, his worship, impartial arbitrator, indicator, judge, justice, magistrate, maven, moderator, referee, refined palate, third party, umpire, virtuoso, broker, connection, contact, go-between, interagent, intermediary, intermediate, intermedium, internuncio, interpleader, mediator, medium, middleman, negotiant, negotiator, account, account as, act between, adjudge, adjudicate, adjudicator, administer, administer justice, administrate, allow, appraise, appraiser, appreciate, approximate, arbitrate, assess, assume, bargain, be afraid, b