Simple past tense and past participle of unbias.(verb)
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Use "unbiassed" in a sentence
"But his unbiassed opinion, his mature judgment, his enlightened conscience, he ought not to sacrifice to you, to any man, or to any set of men living."
"What all this amounted to was that the most careful study by the most unbiassed observers of the entire course of human history had been unable to unearth a single example of human evolution."
"There are few reports of the crimes in Iraq and Afghanistan because we in this country have well-behaved media - which is to the benefit of Israel, as any unbiassed review of the coverage will confirm."