Dictionnaires en ligne gratuits: Anglais, Espagnol, Français, Italien, Chinois, Allemand, Russe traductions, définitions, synonymes...
unintelligible  
Unintelligible language is impossible to understand, for example because it is not written or pronounced clearly, or because its meaning is confused or complicated.  adj  (=incomprehensible) 
He muttered something unintelligible...