Supposably means "as may be conceived or imagined" and is the adverb form of supposable, which means "capable of being supposed or conceived." On the other hand, supposedly usually means "allegedly." The words are often conflated when one usually intends to say "supposedly."

Is Supposably being added to the dictionary?

Dictionary.com announced that the word supposably, which is a mispronunciation of supposedly, has been added to its dictionary. ... In addition to supposably, finna was also added, matching Merriam-Webster.com's move to add the word.

How do you use Supposably in a sentence?

An example of supposably used as an adverb is in the sentence, "It's supposably reported that he is going to win the election," which means that it is possible to believe that news reports say he will win the election. Able to be supposed or conjectured. (nonstandard) Supposedly.