flimsiest

/F L IH1 M Z IY0 AH0 S T/
adjective
  1. 1

    Likely to bend or break under pressure.

    โ€œHe expected the flimsy structure to collapse at any moment.โ€

  2. 2

    Weak; ill-founded.

    โ€œa flimsy excuseโ€

Source: https://en.wiktionary.org/wiki/flimsiest, https://en.wiktionary.org/wiki/flimsy