unfounded

[uhn-foun-did]
adjective
1.
without foundation; not based on fact, realistic considerations, or the like: unfounded suspicions.
2.
not established; not founded: the prophet of a religion as yet unfounded.

Origin:
1640–50; un-1 + found2 + -ed2

unfoundedly, adverb
unfoundedness, noun


1. groundless, idle, false, unjustified, unsubstantiated.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unfounded (ʌnˈfaʊndɪd)
 
adj
1.  (of ideas, allegations, etc) baseless; groundless
2.  not yet founded or established
 
un'foundedly
 
adv
 
un'foundedness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

unfounded
1648, "having no foundation or basis," from un- (1) "not" + pp. of found (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
However, the hypothesis of human-caused climate change is unfounded.
However, preliminary data from the first year of fishing under the sector
  system show that these concerns were unfounded.
But any notion that body armor and medicine have somehow made this war safe is
  unfounded.
More careful consideration shows, however, that this anxiety is unfounded.
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