adjective, flimsier, flimsiest.
without material strength or solidity: a flimsy fabric; a flimsy structure.
weak; inadequate; not effective or convincing: a flimsy excuse.
noun, plural flimsies.
a thin kind of paper, especially for use in making several copies at a time of an article, telegraphic dispatch, or the like, as in newspaper work.
a copy of a report or dispatch on such paper.

1695–1705; flim- (perhaps metathetic variant of film) + -sy

flimsily, adverb
flimsiness, noun

1. shoddy, weak, unstable, unsteady. 2. unconvincing, lame, vague.

1. sturdy.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
flimsy (ˈflɪmzɪ)
adj , -sier, -siest
1.  not strong or substantial; fragile: a flimsy building
2.  light and thin: a flimsy dress
3.  unconvincing or inadequate; weak: a flimsy excuse
4.  thin paper used for making carbon copies of a letter, etc
5.  a copy made on such paper
6.  a slang word for banknote
[C17: of uncertain origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1702, perhaps a metathesis of film "gauzy covering."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Included carrying case is basically a thin, flimsy sheath not suitable for
  transporting anything of value.
Light-weight but fabric is more substantial than many other travel pants that
  feel too flimsy.
The removable plastic backing that protects the phone's innards is thin and
The thin membrane beneath the keys is flimsy and deforms as you type.
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