contrary vs invalid

contrary

adj
  • Opposed; contradictory; inconsistent. 

  • Opposite; in an opposite direction; in opposition; adverse. 

  • Given to opposition; perverse; wayward. 

adv
  • Contrarily 

noun
  • One of a pair of propositions that cannot both be simultaneously true, though they may both be false. 

  • The opposite. 

invalid

adj
  • Not valid; not true, correct, acceptable or appropriate. 

  • Suffering from disability or illness. 

  • Intended for use by an invalid. 

verb
  • To make invalid or affect with disease. 

  • To exempt from (often military) duty because of injury or ill health. 

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