Antonyms of noun illness

1 sense of illness

Sense 1
illness, unwellness, malady, sickness -- (impairment of normal physiological function affecting part or all of an organism)
       Antonym of wellness (Sense 1)
      => health, wellness -- (a healthy state of wellbeing free from disease; "physicians should be held responsible for the health of their patients")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun illness

1 sense of illness

Sense 1
illness, unwellness, malady, sickness -- (impairment of normal physiological function affecting part or all of an organism)
       => ill health, unhealthiness, health problem -- (a state in which you are unable to function normally and without pain)

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