What Does Infirm Of Purpose Mean?

What Does Infirm Of Purpose Mean? When Lady Macbeth calls her husband “infirm of purpose,” she refers back to the root meaning of “infirm”: unsteady, “not firm.” Macbeth’s resolve (“purpose”) is weak; he fears the deed he’s done, and thus he’s also “infirm” in the modern sense: his will is crippled. Who said infirm of