unattended

un- +‎ attended

unattended (not comparable)

1. Not attended; without persons present.

   The meeting went largely unattended, since it took place on Christmas Eve.

   System administrators may schedule an unattended installation of the software.

   • 1941 October, “Notes and News: A Highland Runaway”, in Railway Magazine, page 469:

     Considerable excitement was caused on the L.M.S.R. Aberdeen line out of Perth recently when a shunting engine in Perth North goods yard, whose driver and fireman were absent, was accidentally set in motion by a shunter and set off unattended on to the main line.

2. Not attended to; not receiving attention.

   The fire was caused by an unattended electric blanket.

   • 1987 August 15, Tom Keske, “Open Defiance of Sodomy Laws”, in Gay Community News, volume 15, number 5, page 4:

     I have been attempting to persuade gay organizations and leaders to take this approach, without concrete results. It is a serious failure of gay leadership not to have organized open defiance of sodomy laws, and my own attitude is not to wait for leaders when there is an unattended need.

• “unattended”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.