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unattended (adj.)
[unattended 词源字典]
c. 1600, "alone, unaccompanied," from
un-
(1) "not" + past participle of
attend
(v.). Meaning "with no one in attendance" is from 1796.
[unattended etymology, unattended origin, 英语词源]
[unattended 词源字典]