| dry pleurisy | |
| dumdum fever | |
| dysentery | |
| dyspepsia | |
| elephantiasis | |
| emphysema | |
| empyema | |
| encephalitis lethargica | |
| endemic(noun, disorder, illness, defect, sickness) | |
| enteric fever | |
| epidemic(noun, disorder, defect, taint, affliction) | |
| epidemic pleurodynia | |
| exanthema | |
| failing(noun, disorder, weakness, fault, illness) | |
| failing health(noun, expression, disorder, collapse, disturbance) | |
| famine fever | |
| fault(noun, disorder, weakness, illness, failing) | |
| feebleness(noun, disorder, weakness, fault, illness) | |
| fibrinous pneumonia | |
| fit(noun, disorder, collapse, disturbance, defect) |
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| APA | Smart Define. (2015). flu thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/flu/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "flu thesaurus" https://smartdefine.org/flu/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, flu thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/flu/thesaurus/synonyms>. |
| MLA | Smart Define. "flu thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/flu/thesaurus/synonyms> |