You can describe weak, thin, and fragile things as flimsy. Onion smells are strong, onion skins are flimsy. Blaming onions for making you cry during a sad movie, that's a flimsy excuse, when there are no onions in the theater.

A flimsy object and a flimsy objection or excuse are both without weight and are easy to knock down. You can see right through a flimsy curtain, and you can see right through a flimsy lie. If a tent or house of cards is flimsy, it will fall down with a slight breeze, and if your story isn't convincing anyone, it's probably weak and flimsy enough to flatten, too.

Definitions of flimsy
  1. noun
    a thin strong lightweight translucent paper used especially for making carbon copies
    synonyms: onionskin
    see moresee less
    type of:
    typewriter paper, typing paper
    writing paper suitable for use in a typewriter
  2. adjective
    lacking solidity or strength
    “a flimsy table”
    flimsy construction”
    wanting in physical strength
  3. adjective
    lacking substance or significance
    synonyms: fragile, slight, tenuous, thin
    insignificant, unimportant
    devoid of importance, meaning, or force
  4. adjective
    not convincing
    synonyms: unconvincing
    not capable of persuading
    incredible, unbelievable
    beyond belief or understanding
    see moresee less
    causing one to believe the truth of something
    appearing to merit belief or acceptance
    disenchanting, disillusioning
    freeing from illusion or false belief
    intended or having the power to induce action or belief
    show more antonyms...
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