Lack of strength; weakness, feebleness; powerlessness; spiritual weakness, unworthiness. Occasionally also: an instance of this.

The quality of being frail; liability to be broken or destroyed, fragility; lack of permanence; weakness, physical or mental; moral weakness…

Weakness or want of strength; lack of power to do something; inability. Also with plural an instance or case of this.

Weakness in a mental or moral quality.

The quality of being brittle.

The quality or condition of being bruckle (in senses 2 3); weakness, frailty; brittleness.

weak side. (a) Of a fortified place: A side defectively fortified or unsound in its defences. (b) figurative.

In particularized uses. An infirmity of character, a failing.

Diluted condition, wateriness, weakness (of a liquid); figurative feebleness, lack of solidity (of thoughts, etc.).

The state or quality of being feeble (in the various senses of the adjective); an instance of this.

The action of enervating; the state of being enervated: see enervate, v.

feet of clay (cf. Dan. ii. 33 ‘his feet part of iron and part of clay’): a fundamental weakness in someone supposedly of great merit. Also…

The quality or condition of being boneless (in various senses).

spinelessness.

The quality or condition of being limp.

Lack of courage, resolve, or strength of purpose; disinclination to act or assert oneself; weakness, timidity, spinelessness. Cf. invertebrate, adj.…

Lack of courage, resolve, or strength of purpose; disinclination to act or exert oneself; weakness, spinelessness. With reference to writing, music…

lack of determination.