run-of-the-mill vs unconventional

run-of-the-mill

adj

  • Ordinary; not special. 

unconventional

adj

  • Out of the ordinary 

  • Not adhering to convention or accepted standards 

  • Atypical 

noun

  • Something or someone that is unconventional. 

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