Blockhead (noun)

A stupid or foolish person.

Origin:

Mid 16th century: from block + head.

Examples:

1. The blockhead didn't realize that he was making a fool of himself.
2. The blockhead was so clueless that he asked if the sun rose in the west.
3. The blockhead was constantly getting into trouble due to his lack of common sense.
4. The blockhead seemed to have no sense of logic or reason, and made decisions based purely on emotion.
5. Despite his good intentions, the blockhead was constantly causing problems due to his lack of intelligence.