round the bend vs wacko

round the bend

prep

  • Crazy, mad or insane. 

  • Close to or in close proximity to another location. 

wacko

noun

  • An amusingly eccentric or irrational person. 

adj

  • Amusingly eccentric or irrational. 

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