Chronic ( Greekchronos) - for example a chronicillness is one that persists for a long time, usually more than 3 months. By analogy, this adjective has come to describe the solution of a problem that is not possible in a short time, or that if once solved will reoccur.
Examples of chronic conditions:
... $72,500, and the median income for a family is $89,211. Males have a median income of $51,172 versus $32,500 for females. The per capita income for the town is $28,378 ...