I wonder that sometimes. Even people I consider mostly stupid will sometimes refer to someone else as dumb.
Is it the absence of intelligence, the way that cold is simply an absence of heat?
Or is it something more…
It strikes me, long observing people, that a lot of the time stupidity is simply laziness, only it’s the brain rather than any muscle that people avoid exercising. Thinking, like anything else, takes a degree of effort.
It’s easy to go through life on autopilot, not really conscious of one’s surroundings most of the time. Not tuned in. Not paying attention. Not engaging in the world outside.
Some forms of stupidity strike me as someone simply not ‘switching on’ for even a moment.