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[ground-lis] /ˈgraʊnd lɪs/
without rational basis:
groundless fears.
Origin of groundless
before 900; Middle English: bottomless, unfathomable; Old English grundlēas. See ground1, -less
Related forms
groundlessly, adverb
groundlessness, noun
baseless, unfounded, unjustified, idle. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for groundless
  • More than a decade later, their fears appear to have been groundless.
  • If what she says is true, her claim is not groundless.
  • Their concerns, it would seem, are not entirely groundless.
  • We don't even know what g is, or if it exists, so the idea that it can be measured is evidentially groundless.
  • Warner's worries about poor box-office returns proved groundless.
  • In both cases, the fear was neither groundless nor unreasonable.
  • To the reader today of his later addresses, that criticism must seem groundless.
  • The fear that vocational training will materialize and lower education is groundless, even in theory.
  • The prelate found their invectives groundless, except that the want of a priest was a real defect in the community.
  • When the alarm that had tricked them into marriage proved to be groundless, she was angry and said bitter, hurtful things.
British Dictionary definitions for groundless


without reason or justification: his suspicions were groundless
Derived Forms
groundlessly, adverb
groundlessness, 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
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Word Origin and History for groundless

Old English grundleas "bottomless, unfathomable, vast;" see ground (n.) + -less. Figurative sense of "unfathomable" is from early 14c. Related: Groundlessly; groundlessness.

Online Etymology Dictionary, © 2010 Douglas Harper
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