disinterested
dis-IN-truh-stidadjMeaning having nothing to gain or lose, and so able to judge fairly
Memory hook no INTEREST (no stake) in who wins. Professor Edwin judges the pet show because he owns no pets: he gains nothing whoever wins. He is disinterested.
We asked a disinterested neighbor to settle the argument, since she had no stake in it.
In context The two bakeries agreed to let a disinterested expert choose the best bread; because she would earn nothing either way, both trusted her verdict.
Similar impartial, neutral, unbiased
Opposite biased, partial, involved
From dis- (not) + interested, in its old sense of “having a stake or a share.”