flimsy

weak and unconvincing proof or reason

a weak excuse that is easy to see through

estructura endeble

a building or object that is badly built and not strong

una estructura que es débil, delgada y se daña fácilmente

pretexto poco sólido

a weak reason given to justify an action that is not the real reason

una razón débil o apenas creíble dada para justificar una acción

pretexto endeble

an unconvincing attempt to make something that is not the case appear true

Un acto de fingir débil y poco convincente.

tienda de campaña frágil

a tent made of thin material that does not offer much protection

una tienda de campaña hecha de material delgado que no ofrece mucha protección