From The Collaborative International Dictionary of English v.0.48:
Weakness \Weak"ness\, 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]
Syn: Feebleness; debility; languor; imbecility; infirmness;
infirmity; decrepitude; frailty; faintness.
[1913 Webster]