off-centre vs wacko

off-centre

adj

  • eccentric, unbalanced 

  • (of an axis etc) displaced from the centre 

wacko

adj

  • Amusingly eccentric or irrational. 

noun

  • An amusingly eccentric or irrational person. 

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