When kids play in the backyard without an adult watching over them, they are playing unsupervised, meaning they are not being directly monitored by anyone.
To be unsupervised means to do something without any oversight or supervision. For example, if students are left in a classroom without a teacher present, they are unsupervised. This can apply to various situations, from children playing to employees working without a manager's presence. While being unsupervised can offer freedom and independence, it also requires a level of responsibility and trust to ensure everything goes smoothly.