Etymology
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flimsy (adj.)

1702, of unknown origin, perhaps a metathesis of film (n.) "gauzy covering" + -y (2). Figuratively (of arguments, etc.) from 1750s. Related: Flimsily; flimsiness.

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Definitions of flimsy
1
flimsy (adj.)
lacking solidity or strength;
flimsy construction
a flimsy table
Synonyms: insubstantial
flimsy (adj.)
not convincing;
a flimsy argument
Synonyms: unconvincing
flimsy (adj.)
lacking substance or significance;
Synonyms: fragile / slight / tenuous / thin
2
flimsy (n.)
a thin strong lightweight translucent paper used especially for making carbon copies;
Synonyms: onionskin
From wordnet.princeton.edu