I would argue any hard working is not clever by definition. But the ones who are otherwise clever but have a blind spot on the hard working part - they are scar

I would argue any hard working is not clever by definition. But the ones who are otherwise clever but have a blind spot on the hard working part - they are scary. How efficiently and how far they can get into completely wrong and unexpected direction before stopping to think the overall picture can be mindboggling. The hardworking idiots are useful as long as their direction is contained.