unprejudiced; not personally involved
Whenever two reasonable people are unable to settle a difference of opinion on some matter, they should seek the opinion of a disinterested third party.
dis (not, un)#inter (between)#esse (to be) (Latin)
disinterested, impartial, objective
Dis-Interest. if a particular issue is not of any interest to me (dis-interest), i'll pass a biased free opinion about it. Dis - Not + Interested. The Judge was not interested in the case, so he was not bothered about the outcome; he was disinterested and unprejudiced towards the case.