What does "modesty" mean?

Modesty: Natural delicacy or shame regarding personal charms and the sexual relation; purity of thought and manners; due regard for propriety in speech or action. Her blush is guiltiness, not modesty. Shak. Modesty piece, a narrow piece of lace worn by women over the bosom. [Obs.] Addison. See Bashfulness, and Humility.