a 'flimsy' piece of material
a movie with a 'flimsy' plot
a 'flimsy' [='weak'] excuse
(..) - But he's still gotta pay for what he did. - I'm with you. - OK. Are you finished? - Yeah. It is obvious to me that the boy's entire story was flimsy. He claimed he was at the movies, yet he couldn't remember the names of the films he saw or who played in them. - That's right. (..)1957 12 Angry Men