debility

n. weakness, feebleness; disability

In general, debility refers to a loss of strength.In astrology, a debility is referred to when a planet or other celestial body is in the sign of its detriment or fall.In medicine, debility refers to being weak or feeble.
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Debility /de·bil·i·ty/ asthenia. de·bil·i·ty n. The state of being weak or feeble; infirmity. debility, n weakness; lack of strength; asthenia. [more]Debility - Community and Resources

Noun
1. the state of being weak in health or body (especially from old age)
(synonym) infirmity, frailty, feebleness, frailness
(hypernym) unfitness, poor shape, bad condition
(hyponym) asthenia, astheny
(derivation) enfeeble, debilitate, drain

(a.)
The state of being weak; weakness; feebleness; languor.