acceptable vs below par

acceptable

adj
  • worthy, decent, sure of being accepted or received with at least moderate pleasure 

  • Barely worthy, less than excellent; passable. 

below par

prep
  • Not up to the average or normal standard. 

  • (of a score) Less than par for the hole or course (which in golf, means better than par). 

  • Having a price below its face value. 

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