I'm not studying Italian, but still found the discussion quite interesting. Thank you all.
It is called "erre moscia", or, if the "impedement" is quite strong, the person could be called "bleso/a". It is a bit different from the French one as the sound is less strong.
@Zechmann that's interesting! the french "r" sounds more difficult to me.
I'm not Italian but I do am italian mother tongue since I grew up in the italian part of Switzerland,
and I can say that some people do have problems about the r prononciation.
But that's is nothing to do with the trill sound.
Some people just pronounce the "r" as the french r.
It means, they pronoune with the throat and not the tongue.
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