Foolhardiness is a synonym of inadvisability.
As nouns the difference between foolhardiness and inadvisability
is that foolhardiness is the quality of being foolhardy while inadvisability is the quality or state of being inadvisable.
foolhardiness
English
Noun
(en-noun)
The quality of being foolhardy.
inadvisability
English
Noun
(-)
The quality or state of being inadvisable.
:I had been warned of the inadvisability of disturbing sleeping dogs, so it did not surprise me when the wakened dog snarled at me.
Synonyms
*(quality or state of being inadvisable) foolhardiness, impropriety, imprudence, injudiciousness, rashness