probable vs willow in the wind

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. 

willow in the wind

noun
  • One whose views are easily and regularly changed by the persuasion or influence of others. 

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