unbiased

un|bi|ased /'ʌnb'aɪəst/
also unbiassed
[ADJ]
If you describe someone or something as unbiased, you mean they are fair and not likely to support one particular person or group involved in something.
There is no clear and unbiased information available for consumers...
The researchers were expected to be unbiased.
...an unbiased jury.
= impartial
≠ biased