| indisposition(noun, disorder, disease, weakness, collapse) | |
| infantile paralysis | |
| infectious mononucleosis | |
| infirmity(noun, disorder, disease, weakness, collapse) | |
| inflammation(noun, disorder, illness, defect, sickness) | |
| inflammatory rheumatism | |
| insubstantiality(noun, weakness, failing, infirmity, fragility) | |
| jail fever | |
| jungle rot | |
| kala azar | |
| kissing disease | |
| la grippe | |
| laryngitis | |
| lepra | |
| leprosy | |
| leptospirosis | |
| lipoid pneumonia | |
| loa loa | |
| loaiasis | |
| lobar pneumonia |
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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> |