A HERETIC is someone who doubts or challenges the accepted doctrines of a religion, philosophy, or ideology. The term 'HERETIC' is derived from the Greek word 'hairetikos', which means 'able to choose'. A HERETIC is someone who questions the established beliefs and practices of a particular group, often in an attempt to bring about change. They are often seen as a threat to the status quo and can be met with hostility or even persecution.