- uninterested (adj.)
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[uninterested 词源字典] - 1640s, "unbiased," from un- (1) "not" + past participle of interest (v.). It later meant "disinterested" (1660s); sense of "unconcerned, indifferent" is recorded from 1771. This is the correct word for what often is miscalled disinterested.[uninterested etymology, uninterested origin, 英语词源]