You could use the word 'turgid'...
inertia
The term "doldrums" comes from the Old English word "dol," meaning stupid or foolish. It was originally used by sailors to describe the calm, windless parts of the ocean near the equator that made sailing difficult and slow. Over time, "doldrums" came to signify a state of inactivity, sluggishness, or boredom.
Sloth means laziness, sluggishness etc. The word can be used in different situations. It is used specially as a dislike of work or any kind of physical exertion.
genre...?
The volcano has been inactive for many years.
It is inaction, inactivity, inactiveness
The likely word is hibernation (extreme winter inactivity).
the state of equilibrium or inactivity caused by opposing equal forces
The root word "hibern" is derived from the Latin word "hibernare," which means to spend the winter. It is commonly used in words related to hibernation, which is a state of inactivity and metabolic depression in animals during the winter months.
Try 'idleness'.
Stupor, being stunned into inactivity.
literature and books are a subject such as reading and language arts.