Etymology
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uninterested (adj.)

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.

updated on February 25, 2014

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Definitions of uninterested from WordNet

uninterested (adj.)
not having or showing interest;
an uninterested spectator
uninterested (adj.)
having no care or interest in knowing;
she appeared totally uninterested
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.