rigorous vs scabious

rigorous

adj
  • Severe; intense. 

  • Showing, causing, or favoring rigour/rigor; scrupulously accurate or strict; thorough. 

scabious

adj
  • Having scabs. 

  • Of or pertaining to scabies. 

noun
  • Any of various herbaceous plants of the genus Scabiosa. 

  • Any of several plants of the genus Knautia. 

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