unsubstantiated

[uhn-suhb-stan-shee-ey-tid]
adjective
1.
not substantiated; unproved or unverified: unsubstantiated allegations.
2.
being without form or substance.

Origin:
1765–75; un-1 + substantiate + -ed2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unsubstantiated (ˌʌnsəbˈstænʃɪˌeɪtɪd)
 
adj
not established as valid or genuine: unsubstantiated allegations

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
It has been parroted by all of the published popular and academic authors,
  unquestioned and unsubstantiated.
Leveling unsubstantiated claims at an entire category of universities doesn't
  help solve the problem.
My unsubstantiated hunch is that it would show otherwise.
That's completely different from persistent and unsubstantiated whining.
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