Definition of brainless adjective from the Oxford Advanced Learner's Dictionary

 

brainless

 adjective
adjective
BrE BrE//ˈbreɪnləs//
 
; NAmE NAmE//ˈbreɪnləs//
 
Stupid
 
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stupid; not able to think or talk in an intelligent way Her husband’s colleagues were brainless bores. See related entries: Stupid
See the Oxford Advanced American Dictionary entry: brainless