Runt (noun)

1. The smallest or weakest animal in a litter, such as a pig, dog, or cat.
2. A person or thing that is small, weak, or inferior in some way.

Origin:

From the word runt meaning the smallest or weakest animal in a litter.

Examples:

1. The runt of the litter was small and weak.
2. The runt of the litter was often bullied by the other animals.
3. He was the runt of the family, always being picked on by his siblings.
4. She was the runt of the class, always being underestimated.
5. It was the runt of the group, always being overlooked.