unbiased
adjective
uk/ˌʌnˈbaɪəst/ usable to judge fairly because you are not influenced by your own opinions:
He admits that his newspaper was not an unbiased observer in the conflict.
We try to remain as unbiased as we can, but it is difficult.
not affected or influenced by someone's beliefs or opinions:
Every effort is made to present unbiased information.
I need some unbiased advice.
You're asking for an unbiased opinion from someone who is very biased.
The commission's staff is supposed to investigate and study regulations based on unbiased research.