(n) the property of lacking physical or mental strength; liability to failure under pressure or stress or strain, Ant. strength, Example:his weakness increased as he became older; the weakness of the span was overlooked until it collapsed
n. 1. The quality or state of being weak; want of strength or firmness; lack of vigor; want of resolution or of moral strength; feebleness. [ 1913 Webster ]
2. That which is a mark of lack of strength or resolution; a fault; a defect. [ 1913 Webster ]
Many take pleasure in spreading abroad the weakness of an exalted character. Spectator. [ 1913 Webster ]