The judge maintained a neutral stance throughout the trial.

A state of being impartial or not favoring one side over another.
The mediator sought a neutral position.
He offered a neutral opinion.
She chose a neutral color for the room.
maintain neutrality
remain neutral
declare neutrality
impartiality
objectivity
fairness
The referee remained neutral during the game.

Not taking sides in a conflict or disagreement; impartial.
She stayed neutral in their argument.
The country remained neutral in the war.
His opinion was neutral and fair.
remain neutral
stay neutral
neutral observer
impartial
unbiased
disinterested