Established insanity refers to a condition where an individual suffers from mental illness that has been present for an extended period. Synonyms for this term include chronic psychosis, persistent derangement, and long-term psychiatric disorder. Other phrases commonly used to describe this condition include chronic mental illness, severe mental disturbance, and continuing psychological dysfunction. While certain medications and treatments can help manage this type of mental illness, it is often a lifelong condition that requires ongoing support and care. Understanding the various synonyms for established insanity can help individuals and medical professionals better communicate and address this complex mental health issue.