The term "ninja sword" is a broad and often misused term, as historically, there was no specific sword exclusively associated with ninjas. However, if we consider the swords commonly associated with ninjas or used in ninja folklore, such as the ninjato or shinobi-zue (concealed sword cane), their sharpness would vary depending on the specific sword, purpose, and individual preference

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In general, ninja swords were typically intended for stealthy, close-quarters combat and quick, precise strikes. They were often shorter than traditional samurai swords like the katana or wakizashi. The sharpness of a ninja sword, like any other bladed weapon, would rely on factors such as the quality of craftsmanship, materials used, and the edge maintenance.

A well-crafted ninja sword would be expected to have a sharp edge, enabling effective cutting and thrusting techniques. However, the specific sharpness of a ninja sword can vary depending on factors like the swordsmith's skill, the intended purpose of the sword (e.g., self-defense or assassination), and the historical accuracy of the sword in question.

It's important to note that modern reproductions or replicas marketed as "ninja swords" may vary in quality and sharpness. Some may be purely decorative and not intended for practical use, while others may be designed with functional edges suitable for cutting practice or martial arts training.

In summary, the sharpness of a ninja sword can vary depending on the specific sword and its intended use. Historically, ninja swords were expected to have a sharp edge for effective close-quarters combat, but the exact sharpness would depend on various factors including craftsmanship and purpose.