counterfactual vs sour

counterfactual

adj
  • Contrary to known or agreed facts; untrue. 

  • Of or in comparison to a hypothetical state of the world. 

noun
  • A conditional statement in which the conditional clause is false. 

  • A claim, hypothesis, or other belief that is contrary to the facts. 

  • A hypothetical state of the world, used to assess the impact of an action. 

sour

adj
  • Unfortunate or unfavorable. 

  • Having an acidic, sharp or tangy taste. 

  • Peevish or bad-tempered. 

  • Off-pitch, out of tune. 

  • Made rancid by fermentation, etc. 

  • Excessively acidic and thus infertile. 

  • Tasting or smelling rancid. 

  • Containing excess sulfur. 

noun
  • A drink made with whiskey, lemon or lime juice and sugar. 

  • The acidic solution used in souring fabric. 

  • Any cocktail containing lemon or lime juice. 

  • A sour or acid substance; whatever produces a painful effect. 

  • The sensation of a sour taste. 

verb
  • To make sour. 

  • To become sour. 

  • To spoil or mar; to make disenchanted. 

  • To become disenchanted. 

  • To make (soil) cold and unproductive. 

  • To macerate (lime) and render it fit for plaster or mortar. 

  • To process (fabric) after bleaching, using hydrochloric acid or sulphuric acid to wash out the lime. 

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