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 correct grammar?

Supposably means capable of being supposed. In other words, it describes something that's capable of happening. Though supposably is a valid word, it can be tricky to use in a sentence, and isn't often used in modern speech.

How do you use the word Supposably?

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.