Rashness is a synonym of foolhardiness.
As nouns the difference between rashness and foolhardiness
is that rashness is the quality of state of being rash; inconsiderate or presumptuous haste; headstrong precipitation in decision or action; temerity; unwarranted boldness while foolhardiness is the quality of being foolhardy.
rashness
English
Noun
(-)
The quality of state of being rash; inconsiderate or presumptuous haste; headstrong precipitation in decision or action; temerity; unwarranted boldness.
References
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foolhardiness
English
Noun
(en-noun)
The quality of being foolhardy.