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all brawn and no brain

Having great power or physical strength but lacking mental acuity or intelligence. He may have been a good football player in high school, but he was all brawn and no brains, so he didn't get into any colleges.
See also: all, and, brain, brawn

be all brawn and no brains

to be physically strong but not very intelligent I agree he's got a good body, but he's all brawn and no brains.
See also: all, and, brain, brawn