One who cannot be changed or reformed is called as:

🧠 Explanation:

“Incorrigible” describes someone who cannot be changed or reformed, often used for stubborn behavior. This vocabulary term is a key topic in English studies, engaging students and writers. Understanding its meaning enhances communication, relevant for academic writing and social interactions. The word’s precision attracts those improving language skills for exams or professional contexts, emphasizing clear expression in essays, literature, or conversations, making it essential for effective communication across various settings.