possible vs unconvincing

possible

adj
  • Apparently valid, likely, plausible. 

  • Capable of being done or achieved; feasible. 

  • Able but not certain to happen; neither inevitable nor impossible. 

  • Being considered, e.g. for a position. 

noun
  • A possible choice, notably someone being considered for a position. 

  • A particular event that may happen. 

  • A possible one. 

unconvincing

adj
  • not convincing, plausible or believable 

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