What is another word for toughened up?

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

Past tense for to make more strict or stringent
Past tense for to physically harden a substance or material, typically using a chemical process
Past tense for to reinforce the strength or sturdiness of
Past tense for to train or practice so as to be accustomed to a certain condition
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