Synonyms for illness

noun

1. The state of being sick

   sickness, poor health, failing health, ailing, ill health, infirmity, queasiness, vomiting, indisposition, malaise, disorder, relapse, attack, fit, seizure, convalescence, complaint, delicate health, sickliness, unhealthiness, invalidism, decrepitude, collapse, breakdown, confinement, prostration, disability, disturbance, hypochondria, valetudinarianism; see also weakness 1.

2. A particular disease

   sickness, ailment, malady; see disease, insanity 1.