impaired vs tempered

impaired

adj
  • Rendered less effective. 

  • inebriated, drunk. 

noun
  • A criminal charge for driving a vehicle while impaired. 

tempered

adj
  • Moderated or balanced by other considerations. 

  • Pertaining to the metallurgical process for finishing metals. 

  • Pertaining to the well-tempered scale, where the twelve notes per octave of the standard keyboard are tuned in such a way that it is possible to play music in any major or minor key and it will not sound perceptibly out of tune. 

  • Pertaining to the industrial process for toughening glass, or to such toughened glass. 

  • Having a specified disposition or temper. 

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