Yes, Enma is considered a cursed sword in the "One Piece" series. It is said to possess a curse that drains the Haki and energy of its wielder, making it a challenging sword to wield. This curse is attributed to Enma's tremendous power and unique properties.

Enma is one of the 21 Great Grade swords in the world of "One Piece" and is known for its exceptional cutting ability and ability to draw out the full potential of a swordsman's Haki. However, its curse also poses a significant challenge to those who wield it.

In the Wano Country arc of the series, Roronoa Zoro acquires Enma after defeating its previous owner, Kozuki Oden. Despite the curse, Zoro accepts the challenge of wielding Enma and seeks to master its power.

Zoro's journey with Enma showcases his determination and growth as a swordsman, as he strives to overcome the sword's curse and unleash its full potential. The curse of Enma adds an additional layer of difficulty and stakes to Zoro's development and battles in the series.