unattended
adjective /ˌʌnəˈtendɪd/
/ˌʌnəˈtendɪd/
(formal)- without the owner present; not being watched or cared for
- unattended vehicles
- Never leave young children unattended.
- He found the reception desk unattended.
Oxford Collocations DictionaryUnattended is used with these nouns:- vehicle