1. (

• infirmity ,
• frailty ,
• debility ,
• feebleness ,
• frailness ,
• valetudinarianism

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

2. (

• feebleness ,
• tenuity ,

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