What describes a volcano that is not currently active but may become active in the future?

A volcano that is not currently active but has the potential to erupt in the future is described as dormant. This term indicates that while the volcano hasn't shown signs of activity for a significant period, it still retains the possibility of reawakening and becoming active again.

In the context of volcanic activity, an active volcano is one that is currently erupting or has erupted recently, while an extinct volcano is one that is not expected to erupt again in the future due to geological changes that have made it unlikely. The term inactive is somewhat ambiguous and does not carry the same specific geological connotations as dormant, which is why dormant is the most appropriate choice in this case.