What is an unplayable in golf?

Definition

A ball position or situation where a player determines they cannot reasonably attempt to play the ball due to obstacles, hazards, or other circumstances that make a normal stroke impossible or inadvisable. When declaring a ball unplayable, players have several relief options including dropping within two club lengths, dropping behind the position in line with the hole, or returning to the previous shot location, all with a one-stroke penalty. This rule provides options when balls come to rest in impossible positions such as deep bushes, against immovable objects, or in dangerous locations.