of or pertaining to an established church, esp. the Church of England, or the principle of state religion.

( often initial capital letter ) of, pertaining to, or favoring a political or social establishment.

a supporter or adherent of the principle of the establishment of a church by state law; an advocate of state religion.

( often initial capital letter ) a person who belongs to or favors a political or social establishment.

adjective

button-down , conformist , orthodox , straight , traditional