Does Brainless Mean Stupid?

mentally weak; foolish; witless; stupid.

What does the word brainless mean?

1 : devoid of intelligence : stupid a brainless decision. 2 : not demanding understanding or intelligence : dull, stupefying a brainless task brainless repetition. 3 : lacking a brain brainless organisms.

Is brainless an adjective?

Having no brain. unintelligent, with little common sense.