Restricted is the perfect antonym for the word un-restricted. When something is restricted, it's limited or controlled, while un-restricted means it is free from any type of limitations. A restricted person cannot do whatever they want, whereas an un-restricted person can. Along with this, unrestricted activities are open to anyone without any limitations or restrictions, while restricted activities have limitations such as age, location, qualifications, etc. For instance, a restricted area is an area that is only accessible to a specific group of people, while an un-restricted area is accessible to everyone. Overall, the antonym for un-restricted is restricted, implying limitations and controls.