fossilise

Verb

Meaning

become mentally inflexible

convert to a fossil

Source: WordNet

fossilize harden concrete strengthen fix cake clarify solidify stiffen thicken ossified congeal mineralize calcify indurate

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melt relax soften

convert age mature maturate get on senesce

lapidify petrify

The little animals fossilized and are now embedded in the limestone Source: Internet

How to Fossilise Your Hamster. Source: Internet