salutary vs unclean

salutary

adj
  • Effecting or designed to effect an improvement; remedial: salutary advice. 

  • Promoting good health and physical well-being; wholesome; curative. 

unclean

adj
  • Dirty, soiled or foul. 

  • Ritually or ceremonially impure or unfit. 

  • Not moral or chaste. 

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