- mentally weak; foolish; witless; stupid.
Origin of brainless
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for 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
Go back to the lies and hypocrisies of society, and the brainless, mashers who adorn it!The Christian
- stupid or foolish