Synonyms of impartial in English:

unbiased, unprejudiced, neutral, non-partisan, non-discriminatory, anti-discrimination, disinterested, uninvolved, uncommitted, detached, dispassionate, objective, open-minded, equitable, even-handed, fair, fair-minded, just

without favouritism, free from discrimination, with no axe to grind, without fear or favour

informal on the fence