The impediment is really a mispronunciation and its origin is regionally centered in Philadelphia PA. I spoke this way as a child because I was taught to. The distinguishable flaw is when pronouncing words with the letter "L" . Words like like and look and Robert Bazell's favorite, flu. What they do differently is pronounce the L in the back of the mouth (almost throat) rather than using the tip of the tongue behind the upper teeth. As a child I recognized it and made myself pronounce it correctly so it's not that they can't, they probably don't notice it because it's normal to them and where they're from.
If Jim has a lisp, then he has a speech impediment.
Davy has a speech impediment The country's debt has been an impediment to development. A speech pathologist will work with that little girl who has a speech impediment. After the doctor received the million dollar grant from the university his research continued without further financial impediment.
at birth
If a car stops in the middle of the road, it is an impediment to the drivers behind it. I speak with a lisp, therefore I have a speech impediment
War is one of the greatest impediments to human progress. Lack of confidence is an impediment to success. He suffers from a speech impediment:
He was brutally beaten by an angry mob while trying to defend a friend. He developed a speech impediment as a result of his injuries.
His fear of public speaking was a major impediment to his career advancement.
Lisp
George VI
Consider it a speech impediment.
There are various types but all involve the inability to form or pronounce words. A common impediment is stuttering.
There were impediments in the work done. This is a sentence containing the word impediment.