What is the difference between supposedly and supposably? Both are real words but seem to have confusingly similar definitions.
Supposably: Capable of being supposed : conceivable
Supposedly: According to what is generally assumed or believed
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Supposably does mean "it is possible to suppose", as opposed to the very different meaning of "supposedly"!
Supposably is quite rare in actual use; I believe it's more an inkhorn term than one actually found in the wild, so to speak. Thus, I fear that when you encounter it you are probably really encountering somebody who meant to say "supposedly".
I have never heard of the word "supposably" before. Sure enough it's in the dictionary; maybe it's an obsolete word. I suppose (!) it is very rare.
"Supposedly" is usually used to mean, "most people think this is true but I think it is questionable or clearly false". Like, "Today I read an article in a supposedly unbiased newspaper." The sentence implies that the article was in fact biased. Or: "Supposedly, at 8:00 am the employees are all at their desks working." Maybe they should be or they're expected to be, but they really aren't.
Quite frankly, I would never use "supposably." It is, however, certainly present in the American vernacular. As I am a lawyer "supposedly" is most synonymous to "based upon an allegation" and I have used it in that context. "Supposably," were I perchance to ever use it (doubtful/in a creative writing context maybe) would be used in the context more akin to "supposably winters in San Francisco feel warmer than summers." Personally, I shouldn't use either word. Neither is (is there a thread on "both are not," and "Neither is?") as descriptive as another word would be. For example: alleged or assumed. Just sayin....