That can be supposed or conjectured: a supposable outcome. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "supposable" in a sentence
"For example if it makes no difference whether we say that the supposable is not the genus of the opinable or that the opinable is not identical with a particular kind of supposable (for what is meant is the same in both statements), it is better to take as the terms the supposable and the opinable in preference to the phrase suggested."
"The señor had added that it was almost the same with whatever customs duties were collected by the civil officers of the port, with the one drawback that a dishonest army collector, if discovered, might possibly get himself shot as a kind of supposable revolutionist, stealing the profits of the others."
"Still though, it's a lot stronger than * likely* and * supposable*, while making words like * who the hell knows?"