Most of us have something that could be called a deficit, a defect, an insufficiency, a shortcoming, a blemish, an impediment, or an imperfection. It could be a physical attribute that mars our appearance, or something we believe might cause inadequacy or failure in our lives. It's the lack of a usual or needed amount of some quality, attribute, possession, or circumstance.
I had one, and still do to a certain extent. My deficit was an acute and spasmodic red pigmentation level of the facial cortex. I'm other words, I was extremely shy, and that shyness manifested itself with a very red face. This insufficiency (flaw, blemish, imperfection) was no problem as long as I stayed out of any public speaking arena, and public speaking was the last thing I wanted to do anyway.