disinterested
adj.adj. not having any personal interest or concern in a situation. You use this to describe someone who is fair because they do not benefit from the result.
adj. unbiased or impartial, often in a legal or professional context. Refers to a lack of personal stake or self-interest in a matter.
The judge was disinterested in the case.
The committee hired a disinterested third party to ensure the election results were counted fairly.
A disinterested observer might argue that the policy change was purely a matter of efficiency rather than a calculated attempt to gain political favor.
From disinterest (“to cause to be impartial”, verb) + -ed (suffix forming past tense or past participle forms of verbs), or from dis- (prefix meaning ‘not’) + interested (“having a stake in; showing interest”, adjective).
From disinterest + -ed.