probable vs. possible

probable

adjective

  1. likely to occur or prove true:

    He foresaw a probable business loss. He is the probable writer of the article.

  2. having more evidence for than against, or evidence that inclines the mind to belief but leaves some room for doubt.
  3. affording ground for belief.

possible

adjective

  1. that may or can be, exist, happen, be done, be used, etc.:

    a disease with no possible cure.

  2. that may be true or may be the case, as something concerning which one has no knowledge to the contrary:

    It is possible that he has already gone.