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. Why did you ask Todd to come up with a solution to this complex problem? You know that guy is all brawn and no brain. Eh, he's just your typical jock, all brawn and no brain. But if you want a date who can discuss modernist literature, I'm your man!
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