ossified
1. [ adjective ] changed into bone; hardened by deposits of mineral matter
Examples:

"cartilages ossified with age"

Related terms: hard
2. [ adjective ] set in a rigidly conventional pattern of behavior, habits, or beliefs
Synonyms: fossilized fossilised
Examples:

"obsolete fossilized ways" "an ossified bureaucratic system"

Related terms: inflexible
3. [ adjective ] set in a rigidly conventional pattern of behavior, habits, or beliefs
Synonyms: fossilized
Examples:

"obsolete fossilized ways" "an ossified bureaucratic system"

Related terms: inflexible