As nouns the difference between foolishness and knuckleheadedness
is that foolishness is (uncountable) the state of being foolish while knuckleheadedness is the state or condition of being knuckleheaded; foolishness or ineptitude.
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
knuckleheadedness
English
Noun
(-)
The state or condition of being knuckleheaded; foolishness or ineptitude.