unsubstantial

[uhn-suhb-stan-shuhl]
adjective
1.
not substantial; having no foundation in fact; fanciful; insubstantial: an unsubstantial argument; unsubstantial hopes.
2.
without material substance: an unsubstantial ghost.
3.
lacking material substance; materially paltry: an unsubstantial dinner of bread and cheese.
4.
lacking strength or solidity; flimsy: an unsubstantial wall of cardboard.

Origin:
1425–75; late Middle English; see un-1, substantial

unsubstantiality, noun
unsubstantially, adverb
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World English Dictionary
unsubstantial (ˌʌnsəbˈstænʃəl)
 
adj
1.  lacking weight, strength, or firmness
2.  (esp of an argument) of doubtful validity
3.  of no material existence or substance; unreal
 
unsubstanti'ality
 
n
 
unsub'stantially
 
adv

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Example sentences
The unsubstantial belief of his day was ether, or more precisely the naïve
  version of ether that preceded relativity.
There has always been something unsubstantial about his work.
But suddenly the unsubstantial aspects of it overwhelm him completely.
It is as shallow and unsubstantial as a pie-plate without any pie.
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