Definition of unattended adjective from the Oxford Advanced Learner's Dictionary

 

unattended

 adjective
adjective
BrE BrE//ˌʌnəˈtendɪd//
 
; NAmE NAmE//ˌʌnəˈtendɪd//
 
(formal)
 
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without the owner present; not being watched or cared for unattended vehicles Never leave young children unattended.Extra examples He found the reception desk unattended. She was reprimanded for leaving the children unattended. The insurance policy covers loss of money or valuables from an unattended vehicle.
See the Oxford Advanced American Dictionary entry: unattended