What is the meaning of leaden?

adjective

• Darkened with overcast.
  • usage: "a dark day"; "a dull sky"; "the sky was leaden and thick"
  • synonyms: dull
• Made heavy or weighted down with weariness.
  • usage: "his leaden arms"; "weighted eyelids"
  • synonyms: weighted
• Made of lead.
  • usage: "a leaden weight"
• Of movement. ( slow and laborious)
  • usage: "leaden steps"
  • synonyms: plodding
• Lacking lightness or liveliness.
  • usage: "heavy humor"; "a leaden conversation"
  • synonyms: heavy