What is the definition of fatuosity?

Fatuosity is a noun meaning foolishness or silliness. It refers to a lack of intelligence, understanding, or good judgment.

Here are some synonyms for fatuosity:

* Stupidity

* Foolishness

* Inanity

* Nonsensicality

* Gullibility

* Naivete

Example:

"The fatuosity of his arguments was evident to everyone in the room."

Note: While "fatuous" can be a harsh word, it is often used to describe someone who is simply misguided or lacking in common sense, rather than being malicious or intentionally harmful.