Disinterested means "impartial" or "not taking sides." (In other words, not having a personal interest at stake.)

Uninterested means "not interested." (In other words, not showing any interest.)

Correct: A good referee should be disinterested.

(He does not take sides.) Incorrect: He was disinterested in Jill's hobby. Correct: He was uninterested in Jill's hobby.

(He shows no interest.)

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