groundless

[ ground-lis ]

/ ˈgraʊnd lɪs /

SEE MORE SYNONYMS FOR groundless ON THESAURUS.COM

adjective

without rational basis: groundless fears.

Nearby words

groundfire, groundhog, groundhog day, grounding, groundkeeper, groundless, groundlessly, groundling, groundmass, groundnut, groundnut oil

Origin of groundless

before 900; Middle English: bottomless, unfathomable; Old English grundlēas. See ground¹, -less

SYNONYMS FOR groundless

baseless, unfounded, unjustified, idle.

SEE MORE SYNONYMS FOR groundless ON THESAURUS.COM

Related forms

ground·less·ly, adverbground·less·ness, noun

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for groundless

I can say all of this without hesitation because these concerns have been investigated and found to be groundless.
Pediatrician: Vaccinate Your Kids—Or Get Out of My Office|Russell Saunders|January 30, 2014|DAILY BEAST
“It is not a question of starting an investigation over a case that is groundless,” he said.
Somalia Jails Woman and Journalist Over Soldier Rape Claims|Laila Ali|February 9, 2013|DAILY BEAST
At the most basic legal level, the charges of plagiarism are groundless.
Is Bob Dylan a Phony?|Sean Wilentz|April 30, 2010|DAILY BEAST
He then acknowledged that the notion of "a methodical regularity" in the Essay on Criticism was a "groundless opinion."
The Works of Alexander Pope, Volume 2 (of 10)|Alexander Pope

You would be surprised if you knew the number of complaints made to us, which, on investigation, turn out to be groundless.
Post Haste|R.M. Ballantyne
But a still more satisfactory answer is, that the apprehension of danger is groundless, and therefore the whole argument fails.
Select Speeches of Daniel Webster|Daniel Webster
But soon after, a lieutenant of the artillery came in with a groundless report that Green had received reinforcements.
Recollections with the Third Iowa Regiment|Seymour D. (Seymour Dwight) Thompson
I was, at first, inclined to suspect in my friend some capricious and groundless antipathy.
Arthur Mervyn|Charles Brockden Brown

British Dictionary definitions for groundless

groundless

/ (ˈɡraʊndlɪs) /

adjective

without reason or justificationhis suspicions were groundless

Derived Forms

groundlessly, adverbgroundlessness, noun

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012