gibberish vs lackwit

gibberish

adj
  • unintelligible, incoherent or meaningless 

noun
  • Needlessly obscure or overly technical language. 

  • Speech or writing that is unintelligible, incoherent or meaningless. 

  • A language game, comparable to pig Latin, in which one inserts a nonsense syllable before the first vowel in each syllable of a word. 

lackwit

adj
  • Foolish; idiotic or simple-minded. 

noun
  • A witless person; a fool. 

How often have the words gibberish and lackwit occurred in a corpus of books? (source: Google Ngram Viewer )