fossilised
1. [ adjective ] set in a rigidly conventional pattern of behavior, habits, or beliefs
Synonyms: ossified fossilized
Examples:

"obsolete fossilized ways" "an ossified bureaucratic system"

Related terms: inflexible
Similar spelling:   fossilise
  fossilized
  fossilize
  fossilist
  focalise
  fossilisation
  fossilization
  fossil_copal