The definition of flimsy is something which is lacking in strength or thin and easily broken.
Difficult to believe; not plausible.
Not likely to happen.
So implausible as to elicit disbelief; unbelievable:
Not dependable or reliable; questionable
Having little bodily flesh or fat; lean or slender.
Not solid or heavy; flimsy; light
Lacking persuasiveness; unconvincing:
Find another word for unconceivable. In this page you can discover 12 synonyms, antonyms, idiomatic expressions, and related words for unconceivable, like: flimsy, implausible, improbable, inconceivable, incredible, shaky, thin, unbelievable, unconvincing, unsubstantial and weak.