It is a super massive semi-dormant/semi-active volcano. It has erupted in the past on about a 150,000 year cycle. While it has been over 150,000 years since the last eruption, there is a tremendous amount of geothermal activity within the boundaries of the park and the surrounding area. There is great concern among geologists that the caldera will erupt again, and if it does, it would be the greatest natural disaster in recorded human history, likely wiping out more than half of the population of the US, and affecting life on a planetary scale.
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Its dormant
dormant
A volcano that is not currently erupting and has not erupted in historical times is considered dormant.
Active
This is described as a dormant volcano (neither active nor extinct).