exceptional vs mediocre

exceptional

adj
  • Better than the average; superior due to exception or rarity. 

  • Corresponding to something of lower dimension under a birational correspondence. 

  • Forming an exception; not ordinary; uncommon; rare. 

noun
  • An exception, or something having an exceptional value 

mediocre

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

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. 

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