un·at·tend·ed
adjective/ˌʌnəˈtendɪd/
/ˌʌnəˈtendɪd/
(formal)- without the owner present; not being watched or cared for
主人不在场的；无人看管（或照料）的 - unattended vehicles
无人看管的车辆 - Never leave young children unattended.
小孩绝不能无人看管。 - He found the reception desk unattended.
他发现接待处无人值守。
Oxford Collocations DictionaryUnattended is used with these nouns:- vehicle
- unattended vehicles