lummox – a clumsy, stupid person
This lumberjack mucks (lummox) everything up. He's a clumsy, stupid person.
Examples of lummox in a sentence
The man was a lummox, it was a miracle he'd survived into adulthood.
They hired the biggest lummox they could find to be the fall guy for their scheme.
The interview did not go well, she came across as such a lummox.