Orthodox(adjective)
Following or conforming to the traditional or generally accepted rules or beliefs of a religion, philosophy, or practice.
Hindi meaning:परम्परानिष्ठ/धर्मनिष्ठ
Synonyms: Conservative, Traditional, Conformist, Conventional
Antonyms: Unconventional, Unorthodox, Untraditional
Example: The tenured economic professors who had taught their orthodox ideas for years did not appreciate questions from the newly hired professor.
Trick to remember: Ortho ke ilaz india me abhi bhi Orthodox trike se hote hai. 
