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Use "foolhardiness" in a sentence
"Meurons, Frances used to expostulate against what she called my foolhardiness in making these evening visits; but their presence made no difference to me."
"Some of the students, however, blamed Helmar for what they termed his foolhardiness in interfering."
"Life is a precious gift from God, and no one has a right to risk his life in a rash foolhardiness, which is very different from the true courage which does not shrink from facing danger if the life of one more helpless than himself is in peril."