| imbecile | |
| impotent(enervated, senescent, irresilient) | |
| in second childhood(expression, idiom, enervated, senescent, irresilient) | |
| in years(expression, idiom, age) | |
| infecund(enervated, senescent, irresilient) | |
| invalid(enervated, senescent, irresilient) | |
| irresilient(enervated, senescent) | |
| laid low(expression, enervated, senescent, irresilient) | |
| marked | |
| matronly | |
| medical specialty | |
| musty | |
| not getting any younger(expression, idiom, aged, older, elderly) | |
| obsolete | |
| old-timer | |
| oldie | |
| oldster | |
| on the ropes(expression, idiom, enervated, senescent, irresilient) | |
| out of condition(expression, idiom, enervated, senescent, irresilient) | |
| out of gas(expression, idiom, enervated, senescent, irresilient) |
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Geriatric on
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| APA | Smart Define. (2015). geriatric thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/geriatric/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "geriatric thesaurus" https://smartdefine.org/geriatric/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, geriatric thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/geriatric/thesaurus/synonyms>. |
| MLA | Smart Define. "geriatric thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/geriatric/thesaurus/synonyms> |