fossilised

/ˈfɑsəlaɪzd/
adjective
  1. Preserved as a fossil; turned into a fossil.
    • The museum displays a fossilised dinosaur egg.
    • Fossilised footprints were found in the ancient riverbed.
    • This fossilised leaf is over 50 million years old.
  2. Fixed, outdated, or unable to change (often used figuratively).
    • The curriculum had become fossilised and needed a complete update.
    • He held fossilised beliefs that no longer made sense in modern society.
    • The company's fossilised management style prevented innovation.
Synonyms
What does "fossilised" mean? | whatsthatwordmean | whatsthatwordmean