지능이나 상식이 부족하여 매우 어리석거나 멍청한.
Lacking intelligence or common sense; extremely stupid or foolish.
예문:
"The movie was criticized for its brainless plot and lack of character development."
"He made a brainless mistake by leaving his car keys inside the locked vehicle."
"I'm tired of these brainless reality shows that offer no educational value."