In general, a greatsword is a large and heavy weapon designed to be wielded with two hands due to its size, weight, and balance. It typically has a long blade and a handle long enough to accommodate both hands, providing stability, control, and the ability to generate power in strikes.

While it is theoretically possible for some individuals with exceptional strength and size to hold a greatsword with one hand, it would be highly impractical and challenging. The weight and length of a greatsword, often exceeding 1.5 meters (5 feet) in overall length, make it difficult to effectively control and maneuver with just one hand.

The two-handed grip on a greatsword allows for better leverage, balance, and precision in wielding the weapon. It also helps distribute the weight more evenly, reducing the strain on the wrists and arms during combat. The use of both hands allows for more efficient and powerful strikes, as well as better defensive maneuvers.

It is worth noting that historical records and artwork depict warriors, such as knights or medieval soldiers, wielding greatswords with two hands. This suggests that two-handed use was the norm and that the design and purpose of the greatsword were optimized for such usage.

If you are interested in learning to wield a greatsword or any other weapon, it is important to receive proper training from qualified instructors who can teach you the appropriate techniques, safety protocols, and the strengths and limitations of the weapon.

As with any weapon, safety and responsible use should always be prioritized, and adherence to local laws and regulations is crucial.