Someone who is impartial is not directly involved in a particular situation, and is therefore able to give a fair opinion or decision about it.
例句
As an impartial observer my analysis is supposed to be objective...作為中立的觀察員,我的分析應該客觀。Careers officers offer impartial advice to all pupils.就業指導員向所有學生提供公正無私的建議。