unattended

/ˈʌnəˌtɛndəd/

/ənəˈtɛndɪd/

Anything unattended is not being looked after or noticed. It's not safe for unattended children to wander too close to a busy street.

There are some places, like a parking lot, where it's fine to leave an unattended car. Other places, like curbside at the airport, unattended vehicles aren't allowed — there must be a person with the car at all times. When something is attended, it's being watched or paid attention. Add the prefix un- ("not"), and you get unattended.

Definitions of unattended

1. adjective

   not watched
   “a fire left unattended”

   synonyms:

   unsupervised

   not under constant observation
2. adjective

   lacking a caretaker
   “many casualties were lying unattended”

   synonyms: neglected

   uncared-for

   lacking needed care and attention
3. adjective

   lacking accompaniment or a guard or escort
   “unattended women”

   “problems unattended with danger”

   synonyms:

   unaccompanied

   being without an escort