The word “stupidity” has several synonyms that can be used to describe a lack of intelligence or foolish behavior.
One synonym is “foolishness”. This term implies a lack of good sense or judgment. For example, “His foolishness led him to make a bad decision.” It suggests a certain degree of carelessness or thoughtlessness.
“ignorance” is another synonym. While it doesn’t exactly mean the same as stupidity, it can imply a lack of knowledge or understanding that can lead to unwise actions. For instance, “Her ignorance of the subject matter caused her to make mistakes.”
“dullness” can also be used as a synonym for stupidity. It suggests a lack of mental sharpness or quickness. For example, “The student’s dullness made it difficult for him to understand the lesson.”
“silliness” is a more lighthearted synonym. It implies a kind of childish or immature behavior that might be considered stupid. For instance, “Their silliness during the meeting was inappropriate.”
Finally, “idiocy” is a very strong synonym for stupidity. It implies extreme foolishness or a complete lack of sense. For example, “His idiocy was evident when he tried to jump off the roof.”