orthodox
adj.adj. following the traditional or accepted rules and beliefs of a religion, philosophy, or society. You use this to describe someone who sticks to the old, established ways of doing things.
adj. conforming to established doctrine, especially in religion or social practice. Often used to describe traditionalist branches of Christianity or Judaism, or conventional methods in a professional field.
He holds very orthodox views on education and discipline.
The doctor suggested an orthodox treatment plan before considering any experimental or alternative therapies.
While her early work was considered radical, her later theories aligned more closely with the orthodox interpretations of economic history favored by the university.
Typically precedes the noun it modifies; when capitalized, it specifically refers to the Eastern Orthodox or Orthodox Jewish faiths.