mediocre vs subnormal

mediocre

noun
  • A person of minor significance, accomplishment or acclaim; a common and undistinguished person. 

  • A member of a socioeconomic class between the upper ranks of society and the agricultural workers. 

adj
  • Having no peculiar or outstanding features; not extraordinary, special, exceptional, or great; of medium quality, almost always with a negative connotation. 

subnormal

noun
  • A person whose abilities are less than normal. 

  • That part of the axis of a curved line which is intercepted between the ordinate and the normal. 

adj
  • denormal 

  • Less than normal. 

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