Foolishness is a related term of foolhardiness.
As nouns the difference between foolishness and foolhardiness
is that foolishness
is (uncountable) the state of being foolish while foolhardiness
is the quality of being foolhardy.
(uncountable) The state of being foolish.
(countable) A thing or event that is foolish, or an absurdity.
* imprudence, folly
* extravagance, irresponsibility
* indiscretion, absurdity
The quality of being foolhardy.