The antonyms for the term "institutionalized adolescent" could be "free-spirited youth," "non-conformist teenager," "unconventional youngster," "unstructured adolescent," or "non-institutionalized teen." These terms suggest a person who is not confined to a particular system or structure in their way of thinking or behavior. Instead, they are free to explore their creativity, individuality, and ideas without the constraints of an institution or authority. These antonyms denote a teenager who has a sense of autonomy and independence, a person who can think and act for themselves by creating their path in life. They are not confined by rules, norms, or authority, but instead, they challenge existing ideas and conventions, paving the way for alternative approaches and solutions.