Simple Definition of brainless
: very stupid or silly
Full Definition of brainless
: devoid of intelligence : stupid <a brainless decision>
Examples of brainless in a sentence
He thought most of his coworkers were brainless.
The plot of the new movie is brainless and the acting is terrible.
First Known Use of brainless
Seen and Heard
What made you want to look up brainless? Please tell us where you read or heard it (including the quote, if possible).