1. Set in a rigidly conventional pattern of behaviour, habits, or beliefs
   - fossilized, ossified

1. Convert to a fossil
   "The little animals fossilised and are now embedded in the limestone"
   - fossilize 
2. Become mentally inflexible
   - fossilize

See also: fossilisation [Brit], inflexible

Type of: age, convert, get on, maturate, mature, senesce

Encyclopedia: Fossilised

• initial offering
• initial public offering
• initial rhyme
• initialisation
• initialise
• initialism
• initialization
• initialize
• initially
• initiate
• initiation
• initiative
• initiator
• initiatory
• inject
• injectable
• injectant
• injection
• injector
• injudicious
• injudiciously
• injudiciousness
• Injun
• Odovakar
• odynophagia