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

• big shot
• Big Sioux River
• big sister
• big spender
• big stick
• Big Sur
• big time
• big toe
• big top
• big tree
• big wheel
• big-bang theory
• big-bellied
• big-boned
• big-bud hickory
• big-chested
• big-cone douglas fir
• big-cone spruce
• big-eared bat
• big-eyed scad
• big-leaf maple
• big-name
• big-shouldered
• big-ticket
• big-tree plum