Dorothea Dix was an American social reformer and an advocate for the mentally ill. She was known for her tireless efforts in improving the conditions of mental institutions and for providing better care and treatment for the mentally ill. There are several synonyms that can be used to describe Dorothea Dix, such as humanitarian, philanthropist, advocate, activist, and reformer. These words highlight her dedication and passion towards social justice and her contribution to the advancement of mental health care. Her work continues to inspire and influence modern-day mental health policies and treatments, making her a trailblazer and a leader in her field.