What is another word for harden?

Need synonyms for harden? Here's a list of words from our thesaurus that you can use instead.

Verb
Make or become hard or harder
“I have seen soft teeth harden after cod liver oil and lots of butter are added to the diet.”
Verb
Make or become more severe and less sympathetic
“An instant later her eyes seemed to harden and become as hard and cold as the rock whose color they took.”
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