adjective, fool·har·di·er, fool·har·di·est.
Related formsfool·har·di·ly, adverbfool·har·di·ness, noun
Examples from the Web for foolhardiness
They are now doomed to a lifetime's torment, reminded of their foolhardiness every time someone tries to call.
He had the courage, the foolhardiness to sign his name to the article, thereby irrevocably committing himself to the propaganda.From the Housetops|George Barr McCutcheon
Withers's gray glance was kind, if it did express the foolhardiness of Shefford's act.The Rainbow Trail|Zane Grey
Instead, he fell to reproaching Ballard for his foolhardiness.The King of Arcadia|Francis Lynde