frailness(n = noun.state) debility, feebleness, frailty, infirmity, valetudinarianism - the state of being weak in health or body (especially from old age);
is a kind of softness, unfitness
has particulars: asthenia, astheny, cachexia, cachexy, wasting
Derived form adjective frail1
Frailty. [1913 Webster]