mentally weak; foolish; witless; stupid.

Origin of brainless

First recorded in 1400–50, brainless is from the late Middle English word braynles. See brain, -less
Related formsbrain·less·ly, adverbbrain·less·ness, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for brainless

Historical Examples of brainless

  • You cannot conceive in your mind how stubborn and brainless they are.

    The White Company

    Arthur Conan Doyle

  • Some big, burly, brainless cur of a fellow was always ahead of me.

  • For an hour he worked with the brainless things that constituted his party.

    The Monster Men

    Edgar Rice Burroughs

  • What interest have you, dare you have, in that brainless boy?

    The Night Riders

    Ridgwell Cullum

  • Go back to the lies and hypocrisies of society, and the brainless, mashers who adorn it!

    The Christian

    Hall Caine

British Dictionary definitions for brainless



stupid or foolish
Derived Formsbrainlessly, adverbbrainlessness, 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