1. infirmity, frailty, debility, feebleness, frailness, valetudinarianism, unfitness, softness

usage: the state of being weak in health or body (especially from old age)

2. feebleness, tenuity, weakness

usage: the quality of lacking intensity or substance; "a shrill yet sweet tenuity of voice"- Nathaniel Hawthorne

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