Definitions from Wiktionary (chronic)

▸ adjective:  Of a problem, that continues over an extended period of time.
▸ adjective:  (medicine) Prolonged or slow to heal.
▸ adjective:  Of a person, suffering from an affliction that is prolonged or slow to heal.
▸ adjective:  Inveterate or habitual.
▸ adjective:  (slang) Very bad, awful.
▸ adjective:  (informal) Extremely serious.
▸ adjective:  (slang) Good, great; "wicked".
▸ noun:  (slang) Marijuana, typically of high quality.
▸ noun:  (medicine) A condition of extended duration, either continuous or marked by frequent recurrence. Sometimes implies a condition which worsens with each recurrence, though that is not inherent in the term.
▸ noun:  A person who is chronic, such as a criminal reoffender or a person with chronic disease.

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