Definition from Wiktionary, the free dictionary
- (not comparable) Having no brain.
- (comparable) Unintelligent, with little common sense.
1907, Robert W[illiam] Chambers, “chapter VI”, in The Younger Set (Project Gutenberg; EBook #14852), New York, N.Y.: A. L. Burt Company, published 1 February 2005 (Project Gutenberg version), OCLC 4241346:
- "I don't mean all of your friends—only a small proportion—which, however, connects your circle with that deadly, idle, brainless bunch—the insolent chatterers at the opera, the gorged dowagers, the worn-out, passionless men, the enervated matrons of the summer capital, […]!"
having no brain
unintelligent; having little or no common sense