subnormal vs unfamiliar

subnormal

adj
  • denormal 

  • Less than normal. 

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. 

unfamiliar

adj
  • Strange, not familiar. 

noun
  • An unfamiliar person; a stranger. 

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