gibberish

noun

1. (uncountable, usually)Speech or writing that is unintelligible, incoherent or meaningless.

   “Such gibberish as children may be heard amusing themselves with.”

   “Could it be, after all, that the whole story was true, and the writing on the sherd was not a forgery, or the invention of some crack-brained, long-forgotten individual? And if so, could it be that Leo was the man that She was waiting for - the dead man who was to be born again! Impossible! The whole thing was gibberish! Who ever heard of a man being born again?”

   “The Game of Thrones novels were best sellers without fleshed-out Dothraki; the languages in Star Wars, one of the most successful franchises ever, are mostly gibberish, even if Han Solo claims to understand Chewbacca’s bestial warbling.”

2. (uncountable, usually)Needlessly obscure or overly technical language.
3. (uncountable, usually)A language game, comparable to pig Latin, in which one inserts a nonsense syllable before the first vowel in each syllable of a word.

adj

1. unintelligible, incoherent or meaningless