Chronic

Chronic ( Greek chronos) - for example a chronic illness 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:

• chronic bronchitis
• chronic lymphocytic leukemia
• chronic fatigue syndrome

See also: acute, subacute.

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"The chronic" is also a slang term for cannabis.