without rational basis: groundless fears.

Origin of groundless

before 900; Middle English: bottomless, unfathomable; Old English grundlēas. See ground1, -less
Related formsground·less·ly, adverbground·less·ness, noun

Synonyms for groundless Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for groundless

Contemporary Examples of groundless

Historical Examples of groundless

  • Possibly the suspicion, the fear that beset him was groundless.

    A Spirit in Prison

    Robert Hichens

  • Captain Dan's fears concerning the safety of his showcases were groundless.

    Cap'n Dan's Daughter

    Joseph C. Lincoln

  • He soon discovered, to his delight, that these fears were groundless.


    Joseph C. Lincoln

  • But if he feared a physical assault, his fear was groundless.

    Cap'n Eri

    Joseph Crosby Lincoln

  • It must be owned that his melancholy is anything but groundless.

    Views and Reviews

    William Ernest Henley

British Dictionary definitions for groundless



without reason or justificationhis suspicions were groundless
Derived Formsgroundlessly, 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

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