S: (n) weakness (the property of lacking physical or mental strength; liability to failure under pressure or stress or strain) "his weakness increased as he became older"; "the weakness of the span was overlooked until it collapsed"
S: (n) property (a basic or essential attribute shared by all members of a class) "a study of the physical properties of atomic particles"
S: (n) attribute (an abstraction belonging to or characteristic of an entity)