Is wisdom lost if not used often?

Wisdom cannot be lost because that is the summary of knowledge unless something directly impacts mental competence. Skill can decrease without practice.

The primary loss regarding wisdom is not from losing what already exists. Instead, the main concern is knowledge becoming outdated.

If a person spends a long time at a factory, they become the expert at the equipment. If one day the factory changes machines and methods, the previous wisdom still exists but is no longer applicable. Wisdom, or insight, is only applicable within a set area and situation. If too much affects the situation, positive or negative, the person’s ideas may no longer be suitable for the situation. Possibly even leading to harm instead of aid.

Never become arrogant within your own knowledge. There is not an end to reach. Instead, wisdom requires constant development and learning. Both of these require humility.