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Illness (Noun)

Impairment of normal physiological function affecting part or all of an organism.

Nouns denoting natural processes.

The patient was suffering from a chronic illness that affected her ability to breathe normally.
Prolonged exposure to toxic chemicals can cause serious illness in humans.
The mysterious illness that spread rapidly through the community left many people baffled and concerned.
Regular exercise and a balanced diet can help prevent many illnesses that are prevalent in modern society.
The old man's illness had progressed to the point where he was unable to walk or care for himself.