Foolishness is a synonym of fatuousness.
As nouns the difference between foolishness and fatuousness
is that foolishness is (uncountable) the state of being foolish while fatuousness is the characteristic of being fatuous.
foolishness
Noun
(uncountable) The state of being foolish.
(countable) A thing or event that is foolish, or an absurdity.
Synonyms
* imprudence, folly
* extravagance, irresponsibility
* indiscretion, absurdity
* ridiculousness
* stupidity
Antonyms
* wisdom
Related terms
* fool
fatuousness
English
Noun
(en-noun)
The characteristic of being fatuous.