| flimsy | (adjective) not convincing | Synonyms: unconvincing |
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| (adjective) lacking solidity or strength | Synonyms: insubstantial |
| (adjective) lacking substance or significance | Synonyms: fragile, slight, tenuous, thin |
| (noun) a thin strong lightweight translucent paper used especially for making carbon copies | Synonyms: onionskin |
| whimsy | (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: arbitrariness, capriciousness, flightiness, whimsey, whimsicality |
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| (noun) an odd or fanciful or capricious idea | Synonyms: notion, whim, whimsey |