foolish vs gibberish

foolish

adj
  • Lacking good sense or judgement; unwise. 

  • Resembling or characteristic of a fool. 

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. 

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