antibiotic vs unclean

antibiotic

adj
  • Of or relating to antibiotics. 

noun
  • Any substance that can destroy or inhibit the growth of bacteria and similar microorganisms, generally transported by the lymphatic system. 

unclean

adj
  • Dirty, soiled or foul. 

  • Ritually or ceremonially impure or unfit. 

  • Not moral or chaste. 

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