Synonyms of 'anneal'
toughenDictionary, steel, strengthen
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When an attitude or opinion hardens or is hardened, it becomes harsher, stronger, or fixed.
Their action can only serve to harden the attitude of landowners.
Such antagonism, he has asserted, strengthened his resolve.
Thesaurus for anneal from the Collins English Thesaurus
to temper or toughen (something) by heat treatment