Etymology
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unbiased (adj.)

c. 1600, literal, in reference to throws at bowls, from un- (1) "not" + biased. Figurative sense of "impartial, unprejudiced" is recorded from 1640s.

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Definitions of unbiased

unbiased (adj.)
characterized by a lack of partiality;
an unbiased account of her family problems
Synonyms: indifferent / unbiassed
unbiased (adj.)
without bias;
Synonyms: unbiassed
From wordnet.princeton.edu