The term "in supposable" refers to something that cannot be imagined or thought of. Some antonyms for this word include "imaginable", "conceivable", "plausible", "thinkable", "believable", "unremarkable", "ordinary", "commonplace", "predictable" and "foreseeable". These words express the idea that what was once considered impossible can now be imagined or achieved. For example, technological advances like smartphones or the internet were once impossible to imagine, but now they are commonplace in daily life. In contrast, it is important to remember that just because something is supposable or difficult to imagine, it does not mean that it is impossible.