ultra-orthodox

adjective

1. of, relating to, or conforming to the approved form of any doctrine, philosophy, ideology, etc.
2. of, relating to, or conforming to beliefs, attitudes, or modes of conduct that are generally approved.
3. customary or conventional, as a means or method; established.
4. sound or correct in opinion or doctrine, especially theological or religious doctrine.
5. conforming to the Christian faith as represented in the creeds of the early church.
6. (initial capital letter) of, relating to, or designating the Eastern Church, especially the Greek Orthodox Church.
7. (initial capital letter) of, relating to, or characteristic of Orthodox Jews or Orthodox Judaism.

adjective

1. conforming with established or accepted standards, as in religion, behaviour, or attitudes
2. conforming to the Christian faith as established by the early Church

adjective

1. of or relating to the Orthodox Church of the East
2. (sometimes not capital)
   1. of or relating to Orthodox Judaism
   2. (of an individual Jew) strict in the observance of Talmudic law and in personal devotions

adj.mid-15c., of opinions, faith, from Late Latin orthodoxus, from Greek orthodoxos “having the right opinion,” from orthos “right, true, straight” (see ortho-) + doxa “opinion, praise,” from dokein “to seem,” from PIE root *dek- “to take, accept” (see decent). As the name of the Eastern Church, first recorded in English 1772; in reference to a branch of Judaism, first recorded 1853.