Definitions of leaden:

• adjective:   (of movement) slow and laborious

  Example: "Leaden steps"

• adjective:   made heavy or weighted down with weariness

  Example: "His leaden arms"

• adjective:   lacking lightness or liveliness

  Example: "A leaden conversation"

• adjective:   darkened with overcast

  Example: "The sky was leaden and thick"