Impartial
/ɪmˈpɑːrʃəl/ adjective easyNot favoring one side over another, treating every party with equal fairness.
The judge remained impartial throughout the trial, weighing both attorneys' arguments equally.
Memory Trick
'Im-' (not) plus 'partial' (favoring a part or side) — to be impartial is literally to take no side.