A more thorough explanation:

Definition: (Of land) vacant and neither developed nor cultivated.

Example: The unseated land was overgrown with weeds and had no signs of human activity.

Explanation: When land is unseated, it means that it is not being used for any purpose and is left to its natural state. The example illustrates this by describing how the land is overgrown with weeds and has no signs of human activity, indicating that it is not being developed or cultivated.