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

Derived forms: fossilised, fossilises, fossilising

See also: fossilisation [Brit]

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

• mental confusion
• mental defectiveness
• mental deficiency
• mental dexterity
• mental disease
• mental disorder
• mental disturbance
• mental energy
• mental exhaustion
• mental faculty
• mental health
• mental home
• mental hospital
• mental hygiene
• mental illness
• mental image
• mental imagery
• mental institution
• mental lexicon
• mental measurement
• mental note
• mental object
• mental picture
• mental process
• mental quickness