| five-day fever | |
| flimsiness(noun, weakness, failing, delicacy, infirmity) | |
| flue | |
| fluxing | |
| fragileness(noun, weakness, failing, delicacy, infirmity) | |
| fragility(noun, weakness, failing, delicacy, infirmity) | |
| frailness(noun, disorder, weakness, fault, illness) | |
| frailty(noun, disorder, weakness, fault, illness) | |
| frambesia | |
| glandular fever | |
| hansenosis | |
| head cold(noun, expression, cold) | |
| hemorrhage(noun, disorder, illness, defect, sickness) | |
| hepatitis | |
| herpes simplex | |
| histoplasmosis | |
| hookworm | |
| hydrophobia | |
| illness(noun, disorder, disease, weakness, condition) | |
| imperfection(noun, disorder, weakness, fault, illness) |
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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> |