An unbiased observer is someone who is free from any personal prejudices or preconceptions and is able to view a situation or event in an objective manner. Synonyms for an unbiased observer include impartial witness, disinterested party, neutral observer, detached spectator, unprejudiced bystander, and objective viewer. These terms all describe someone who is not emotionally invested in the situation at hand and is able to provide an objective, fact-based analysis without letting their personal biases or beliefs sway their perspective. An unbiased observer is an essential component of fairness and justice, as they provide an objective, unbiased view of a situation or event.