loony vs off-the-wall

loony

adj

  • Very silly, absurd. 

  • Insane. 

noun

  • An insane or very foolish person. 

off-the-wall

adj

  • Wildly unconventional; bizarre; absurd. 

  • Of a person's behaviour: greatly inappropriate. 

How often have the words loony and off-the-wall occurred in a corpus of books? (source: Google Ngram Viewer )