be all brawn and no brains

be physically very strong but not very intelligent

There is a perception that Domi is all brawn and no brains but that is the furthest thing from the truth. Google

He is all brawn and no brains but don't telll him that to his face, cause he might feed you a knuckle sandwitch.  Google

Someone who is all brawn and no brains....Fred Flintstone would fill that role for us for a solid 10 years. Google

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