negligible vs probable

negligible

adj
  • Able to be neglected, ignored or excluded from consideration; too small or unimportant to be of concern. 

probable

noun
  • A person who is likely to appear or do a certain thing. 

  • Something that is likely. 

adj
  • Supporting, or giving ground for, belief, but not demonstrating. 

  • Likely or most likely to be true. 

  • Likely to happen. 

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