flimsy
FLIM-zeeadjMeaning weak and easily broken; also, hard to believe
Memory hook FILM-thin: FLIM-sy. Kai’s kite is made of film-thin paper and two twigs, and the first gust rips it in half: it is flimsy.
The flimsy umbrella turned inside out at the first gust of wind.
In context His excuse was flimsy: he said he missed practice because his shoelaces were untied, and no one believed him for a second.
Similar weak, fragile, tenuous, feeble
Opposite sturdy, strong, convincing