mind-numbing vs run-of-the-mill

mind-numbing

adj
  • Excessively boring, tedious, or dull; repetitive; of an activity, etc., lacking any interest or variety that might serve as intellectual stimulation. 

run-of-the-mill

adj
  • Ordinary; not special. 

How often have the words mind-numbing and run-of-the-mill occurred in a corpus of books? (source: Google Ngram Viewer )