Meaning of “flimsy” - Learner’s Dictionary

flimsy

adjective uk us /ˈflɪmzi/
THIN

thin and not solid or strong:

a flimsy cardboard box
Aren't you cold in that flimsy dress?
WEAK

A flimsy argument, excuse, etc is weak and difficult to believe:

I'm sick of his flimsy excuses for being late.

(Definition of “flimsy” from the Cambridge Learner’s Dictionary © Cambridge University Press)