unsupervised
🇺🇸
/ˌʌnˈsuːpərvaɪzd/
🇬🇧
/ˌʌnˈsuːpəvaɪzd/
Not being monitored or controlled by someone.
It's not safe to leave an unsupervised child near a swimming pool.
プールの近くで見守られていない子供を置くのは安全ではありません。