Foolishness is a synonym of witlessness.
As nouns the difference between foolishness and witlessness
is that foolishness
is (uncountable) the state of being foolish while witlessness
is the state of being witless; stupidity.
(uncountable) The state of being foolish.
(countable) A thing or event that is foolish, or an absurdity.
* imprudence, folly
* extravagance, irresponsibility
* indiscretion, absurdity
The state of being witless; stupidity