noun. The state of being weak or feeble; infirmity.

noun. The state of being weak or feeble; feebleness; lack of strength or vigor.

noun. Specifically In medicine, that condition of the body, or of any of its organs, in which the vital functions are discharged with less than normal vigor, the amount of power and activity displayed being reduced.

noun. In astrology, a weakness of a planet, due to its position: the reverse of a dignity.

noun. The state of being weak; weakness; feebleness; languor.

noun. A state of physical or mental weakness.

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

"It should be added, that a temporary quantity of strength or debility may be induced by the defect or excess of stimulus above what is natural; and that in the same fever _debility always exists during the cold fit, though strength does not always exist during the hot fit."

debile  debilitate  debilitation  

softness  unfitness  

asthenia  astheny  cachexia  cachexy  wasting  

ability  acceptability  adaptability  admissibility  affordability  

deafness  derangement  dizziness  drowsiness  emaciation  

advanced age  advanced years  adynamia  age of retirement  an incurable disease