easy to believe on the basis of available evidence; "he talked plausibly before the committee"; "he will probably win the election"
vagueness If you say that something is probably the case, you think that it is likely to be the case, although you are not sure. The White House probably won't make this plan public until July Van Gogh is probably the best-known painter in the world
vagueness You can use probably when you want to make your opinion sound less forceful or definite, so that you do not offend people. He probably thinks you're both crazy!. used to say that something is likely to happen, likely to be true etc
with considerable certainty; without much doubt; "He is probably out of the country"; "in all likelihood we are headed for war