adjective.
Of a problem, that continues over an extended period of time.
adjective.
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.
Very bad, awful.
adjective.
Extremely serious.
adjective.
Good, great, as in "wicked"
noun.
A chronic one
noun.
Marijuana, typically of high quality.
noun.
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.