What is the meaning of flimsy?

noun

• A thin strong lightweight translucent paper used especially for making carbon copies.
  • synonyms: onionskin

adjective

• Lacking solidity or strength.
  • usage: "a flimsy table"; "flimsy construction"
• Not convincing.
  • usage: "unconvincing argument"; "as unconvincing as a forced smile"
  • synonyms: unconvincing
• Lacking substance or significance.
  • usage: "slight evidence"; "a tenuous argument"; "a thin plot"; a fragile claim to fame"
  • synonyms: fragile, slight, tenuous, thin