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Adjective: unbiassed  ,ún'bI-ust
Usage: rare (=unbiased)
  1. Characterized by a lack of partiality
    - indifferent, unbiased
     
  2. Without bias
    "The committee sought an unbiassed opinion on the matter";
    - unbiased

See also: impartial, nonpartisan, nonpartizan [rare]