1) Disinterested 2) Dispassionate 3) External 4) Fair 5) Fair-minded 6) Impartial 7) Independent 8) Indifferent 9) Neutral 10) Nonaligned 11) Not biased or prejudiced 12) Not taking sides 13) On the fence 14) Unbiassed 15) Unprejudiced 16) Without an agenda 17) Without bias Found on https://www.crosswordclues.com/clue/unbiased
An estimator b of a distribution's parameter B is unbiased if the mean of b's sampling distribution is B. Formally, if: E[b] = B. Source: Greene, 1993, p 93 Contexts: econometrics Found on http://www.econterms.com/glossary.cgi?query=unbiased