Nincompoop (noun)

1. A person who is foolish, silly, or stupid.
2. A person who is mentally or morally weak or inadequate.

Origin:

The word nincompoop comes from the middle french word "non" meaning not and "comprendre" meaning to understand. it refers to a person who is foolish, silly, or stupid.

Examples:

1. He was called a nincompoop for his foolish decision.
2. She was considered a nincompoop for her inability to understand the situation.
3. The nincompoop's behavior was causing a scene in public.
4. The nincompoop's lack of intelligence was evident in their poor decision making.
5. The nincompoop's foolishness was causing a problem for the group.