flimsy vs weak

flimsy is a noun but weak is not a noun.

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

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

flimsy (adjective)	weak (adjective)
not convincing	wanting in physical strength
lacking solidity or strength	overly diluted; thin and insipid
lacking substance or significance	tending downward in price
	likely to fail under stress or pressure
	lacking bodily or muscular strength or vitality
	wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings
	deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc
	not having authority, political strength, or governing power
	(used of verbs) having standard (or regular) inflection
	deficient in intelligence or mental power
	deficient or lacking in some skill
	(used of vowels or syllables) pronounced with little or no stress