Frailty, thy name is woman

From Shakespeare’s From Shakespeare’s Hamlet, 1602:

Must I remember? why, she would hang on him,
As if increase of appetite had grown
By what it fed on: and yet, within a month –
Let me not think on’t – Frailty, thy name is woman! –
A little month, or ere those shoes were old
With which she follow’d my poor father’s body…

Hamlet is angry that his mother, Gertrude, has married his uncle Claudius within a month of his father’s death. The speech generalizes the attribution of weakness of character from one particular woman to womankind.