brain + -less
brainless (comparative more brainless, superlative most brainless)
- (not comparable) Having no brain.
- (comparable) Unintelligent, with little common sense.
1907, Robert Chambers, chapter 6, The Younger Set:
- “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, […]!”
unintelligent; having little or no common sense