Simple past tense and past participle of toughen.(verb)
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Use "toughened" in a sentence
"Soldiers spin toughened to doing quick as good as ruthlessly what contingency be finished to save themselves."
"This may sound attractive for anyone who's seen their credit card terms toughened in the past year."
"Alternately, the Democratic leadership could add in key Democratic priorities, such as toughened financial regulations, bankruptcy law reforms helping homeowners prevent foreclosure, direct government aid to mortgagees, a tax on the financial industry to pay for the bailout, and the job-creating $60 billion economic stimulus/infrastructure spending package the House passed a few days ago."