Etymology
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uninvited (adj.)

"not having been invited," 1630s, from un- (1) "not" + past participle of invite (v.).

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Definitions of uninvited

uninvited (adj.)
(of a thought or act) unwelcome or involuntary;
uninvited advances
uninvited thoughts
uninvited (adj.)
(of a person) not having been invited;
uninvited guests
From wordnet.princeton.edu