crooked vs viperine

crooked

adj
  • Not straight; having one or more bends or angles. 

  • Set at an angle; not vertical or square. 

  • Dishonest or illegal; corrupt. 

viperine

adj
  • Of, relating to or resembling a viper 

noun
  • Any viper of the subfamily Viperinae 

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