impair vs total

impair

verb
  • To weaken; to affect negatively; to have a diminishing effect on. 

total

verb
  • To demolish; to wreck completely. (from total loss) 

  • To equal a total of; to amount to. 

  • To add up; to calculate the sum of. 

  • To amount to; to add up to. 

adj
  • Entire; relating to the whole of something. 

  • (of a function) Defined on all possible inputs. 

  • Complete; absolute. 

noun
  • An amount obtained by the addition of smaller amounts. 

  • Sum. 

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