Can be confused: disinterested, uninterested (see usage note at the current entry).
Synonyms 1. impartial, neutral, unprejudiced, dispassionate. See fair1.
Antonyms 1. partial, biased.
Usage note Disinterested and uninterested share a confused and confusing history. Disinterested was originally used to mean “not interested, indifferent”; uninterested in its earliest use meant “impartial.” By various developmental twists, disinterested is now used in both senses. Uninterested is used mainly in the sense “not interested, indifferent.” It is occasionally used to mean “not having a personal or property interest.” Many object to the use of disinterested to mean “not interested, indifferent.” They insist that disinterested can mean only “impartial”: A disinterested observer is the best judge of behavior. However, both senses are well established in all varieties of English, and the sense intended is almost always clear from the context.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
1610s, "unconcerned," the sense we now would ascribe to uninterested; with the sense of "impartial" going to disinteressed (c.1600). Modern meaning of disinterested is first attested 1650s. As things now stand, disinterested means "free from personal bias," while uninterested
means "caring nothing for the matter in question."