A more thorough explanation:

Definition: A feud that is nonmilitary, base, or servile in nature.

Example: In medieval times, feuds were originally military in nature and held by military persons. However, as time passed, feuds were bought and sold, and deviations were made from the old fundamental rules of tenure and succession. This led to the creation of proper and improper feuds. Improper feuds were those that were not based on military service and were considered base or servile in nature.

Explanation: The example illustrates how the definition of improper feud refers to a feud that is not military in nature. It shows how the original feuds were military and held by military persons, but as time passed, feuds were bought and sold, and the rules of tenure and succession were changed. This led to the creation of proper and improper feuds, with improper feuds being considered base or servile in nature.