fossilised

/F AA1 S AH0 L AY0 Z D/
adjective
  1. 1

    In a state of fossilization; preserved in rock

  2. 2

    Outmoded

  3. 3

    Having become a fossil: no longer productive

Source: https://en.wiktionary.org/wiki/fossilised, https://en.wiktionary.org/wiki/fossilized