flimsy vs insignificant

flimsy is a noun but insignificant is not a noun.

Word	Noun	Adjective	Verb	Adverb
flimsy	Yes	Yes	No	No
insignificant	No	Yes	No	No

flimsy (noun)	insignificant (noun)
a thin strong lightweight translucent paper used especially for making carbon copies

flimsy (adjective)	insignificant (adjective)
not convincing	devoid of importance, meaning, or force
lacking solidity or strength	signifying nothing
lacking substance or significance	of little importance or influence or power; of minor status
	small and unimpressive