How to Say "impartial" in Spanish
The Spanish word for “impartial” is “objetivo” — B2 level. This is a very common word in everyday Spanish.

Examples
El juez debe ser totalmente objetivo al considerar la evidencia.
The judge must be totally objective when considering the evidence.
Ella siempre da una opinión objetiva de la situación.
She always gives an objective (factual) opinion of the situation.
Es difícil ser objetivo cuando se trata de tu propia familia.
It is difficult to be objective when it concerns your own family.
Agreement is Key
As an adjective, 'objetivo' must change its ending to match the noun it describes. Say 'una perspectiva objetiva' (feminine) and 'un informe objetivo' (masculine).
Ignoring gender agreement
Mistake: “Una decisión objetivo.”
Correction: Una decisión objetiva. (Since 'decisión' is feminine, the adjective must end in '-a'.)
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