A ball in a location that is impossible for the player to hit. Examples are balls hit under trees or in shrubs.
A ball hit into a position that does not allow a player to hit it is considered to be in an unplayable lie. Examples are balls hit under pine trees, balls hit into rocky areas, etc.
A lie in which the ball is impossible to play such as in a thicket of trees.
A lie where it is impossible to play a ball (besides from a water hazard).
You can't hit the ball. One stroke penalty is your reward.
lie from which it's impossible to play the ball, such as when it's wedged between two rocks. The player is allowed to drop the ball, incurring a one-stroke penalty.