Speaking in a way that is clearly understood, no matter what the accent.

It's lisping, various mannerisms, speaking too fast - sometimes all at once - which I seem to have issues with understanding. Not an English native but I have less problems with understanding oldschool actors.

Sean Connery had a particular way of pronouncing words but his speech was flawless. Bruce Willis has his speech impaired these days and he's speaking more slowly but is recorded until he sounds right. Younger actors say "blahblehboo", smile cutely and this hits Netflix screen.