Stupidity
Part of speech: noun
Definition: The property of being stupid. An act that is stupid. Obstinacy.
Example sentence: Juvenile crime is not naturally born in the boy, but is largely due either to the spirit of adventure that is in him, to his own stupidity, or to his lack of discipline, according to the nature of the individual.
Foolishness
Part of speech: noun
Definition: The state of being foolish.A thing or event that is foolish, or an absurdity.
Example sentence: Atheistic evolutionists believe that nothing created everything - a scientific impossibility. It couldn't happen. So they redefine the word 'nothing' to mean 'something,' so that in their unthinking minds, they can justify their foolishness.