unsupervised
adj.not being watched or guided by an adult or a leader. You use this to describe a child or a student who is left alone to do something.
adj.not being monitored, guided, or controlled by an authority figure. Often used to describe children or students in a learning environment.
“The children played unsupervised in the park.”
“The school allows students to work on their projects unsupervised during the final hour of the afternoon.”
“While unsupervised learning in machine learning allows systems to find patterns on their own, it often requires significantly more data than supervised methods to achieve the same level of accuracy.”
“A local authority may, however, determine that safeguards – for example, stopping unsupervised contact – need to be put in place.”
“With the hangdog look of a naughty schoolboy, he is left unsupervised and makes the most of his freedom.”
From un- + supervised.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.