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
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