insignificant vs non-notable

insignificant

adj
  • Not significant; not important, inconsequential, or having no noticeable effect. 

  • Without meaning; not signifying anything. 

non-notable

adj
  • Not notable; not worthy of notice; not noted or distinguished. 

How often have the words insignificant and non-notable occurred in a corpus of books? (source: Google Ngram Viewer )