Simple past tense and past participle of steel.(verb)
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Use "steeled" in a sentence
"I am only too painfully aware that we live just now in conditions in which love must take the aspect of severity; in which the mind must be "steeled" and the resolution "set" for a solemn work of international justice."
"It required some resolution and a "steeled" mind for Father Damien to give himself in early manhood to the service of a leper-struck island, living amid, and dying of, the foul disease which he set out to tend."
"If ever I knew a man whose resolution was "steeled," it was this honoured friend of my early manhood, and the steeling power was simply love."