gibberish vs lethargic

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. 

lethargic

adj

  • indifferent, apathetic 

  • sluggish, slow 

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