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Having no ground or foundation; unsubstantiated: groundless optimism. See Synonyms at baseless.

ground′less·ly adv.
ground′less·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.groundlessness - the quality of lacking substance or value; "the groundlessness of their report was quickly recognized"
worthlessness, ineptitude - having no qualities that would render it valuable or useful; "the drill sergeant's intent was to convince all the recruits of their worthlessness"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
On this subject we had long and animated discussions -- he maintaining the utter groundlessness of faith in such matters, -- I contending that a popular sentiment arising with absolute spontaneity- that is to say, without apparent traces of suggestion -- had in itself the unmistakable elements of truth, and was entitled to as much respect as that intuition which is the idiosyncrasy of the individual man of genius.
When he had bitterly reminded Dounia that he had decided to take her in spite of evil report, Pyotr Petrovitch had spoken with perfect sincerity and had, indeed, felt genuinely indignant at such "black ingratitude." And yet, when he made Dounia his offer, he was fully aware of the groundlessness of all the gossip.
Indeed, Hegel does not relieve the "anxiety of responsibility" and inspires a "conviction of groundlessness" that "can easily induce panic." "We are entirely on our own." (24)
Instead of relaxing into the mysterious ground of being, which to a detached self-consciousness feels like groundlessness, we become preoccupied in striving for self-gratifications we hope will secure a dependable self-ground.
The mind of man is convoluted and cornered with(in) this mesh of "[...] groundlessness, futility and grey opacity" (Fowler 81).
"We have repeatedly informed both the OPCE Executive Council and the United Nations Security Council about the groundlessness of these allegations and wild guesses."
"Members of the diplomatic corps in Lebanon have accompanied Foreign Minister Gebran Bassil on a tour during which they were reassured about the groundlessness of these allegations.
The spokesman added that the OSCE Minsk Group co-chairs themselves stated the groundlessness of this position of Armenia at the meeting with Azerbaijani Foreign Minister Elmar Mammadyarov in Paris on May 15.
Dass concludes that David's Story makes us consider history as bound by "the (enabling) limits and the complexities of all narrativisation" because history, at its base, is language and, thus, can only flaunt the failure of reference, the impossibility of grounding words in the extralinguistic real.While Dass may be right about language's intrinsic groundlessness, I am arguing that it is a historically specific silencing that confronts the narrator of David's Story.
S appealed against that sentence, criticizing it for illegality and groundlessness.