the GNU version of the Collaborative International Dictionary of English
ad. In a probable manner; in likelihood.
The Century Dictionary and Cyclopedia
With probability; in a probable manner; in all likelihood; with the appearance of truth or reality; likely: as, the story is probably true; the account is probably correct.
Plausibly; with verisimilitude.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. easy to believe on the basis of available evidence
ad. with considerable certainty; without much doubt
Word Usage
"Kansas will probably have to beat MU's shaky press tonight without Selby, who is probably doubtful, according to Self because of a stress reaction in his right foot."