bad apple vs wicked

bad apple

noun
  • A person who is not wholesome, honest, or trustworthy, especially one who has an adverse influence on others. 

wicked

adv
  • Very, extremely. 

adj
  • Having a wick. 

  • Excellent; awesome; masterful. 

  • Infested with maggots. 

  • Evil or mischievous by nature. 

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