1. the small rounded end of a pin
2. something very small in size
3. a stupid person
Usage: informal; derogatory

Examples

• The pinhead was barely visible on the tiny sewing pin.
• She found a pinhead-sized hole in the fabric.
• The island appeared as small as a pinhead on the map.
• Don’t be such a pinhead – read the instructions carefully.
• The scratch was no bigger than a pinhead.
• He called his brother a pinhead for forgetting his keys again.