Toughened as a verb is to make tough. while Annealed as a verb is to subject to great heat and then (often slow) cooling, and sometimes reheating and further cooling, for the purpose of rendering less brittle; to temper; to toughen.
Part of speech: verb
Definition: To make tough.
Part of speech: verb
Definition: To subject to great heat and then (often slow) cooling, and sometimes reheating and further cooling, for the purpose of rendering less brittle; to temper; to toughen.
We hope you now know whether to use Toughened or Annealed in your sentence.