Degenerative
Part of speech: noun
Definition: Characterized by or causing degeneration.
Chronic
Part of speech: noun
Definition: A chronic oneMarijuana, typically of high quality.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.
Part of speech: adjective
Definition: That which continues over an extended period of time, often associated with suffering ("long suffering").Prolonged or slow to heal. The opposite of acute.suffering from such afflictionInveterate or habitual.Very bad, awful.Extremely serious.
Example sentence: Illness, especially chronic illness, can be very isolating. Not only does it limit how and when you can socialise, it causes you to feel unattractive.