In medicine, an<unk> disease is a disease with either or both of:
This adjective is part of the definition of several diseases and is, therefore, incorporated in their name, for instance, severe<unk> respiratory syndrome,<unk> leukemia.
The term<unk> ' may often be confused by the general public to mean 'severe'.  This however, is a different characteristic.<unk> hospitals are those intended for short-term medical and/or surgical treatment and care.
Subacute means:
Acute 
Chronic 
Senile
Pandemic
Occult
Male
Grief
Young adult 