The quality of being impossible to know or guess what will happen next because something is random or constantly changing.
From 'un-' (not) plus 'predictability' (from Latin 'praedicere'—to say beforehand). Built from the prefix pattern that reverses meaning.
Quantum physics revealed that unpredictability isn't just a limitation of our knowledge—it's actually built into reality at the smallest scales. Electrons don't have set positions until you measure them!
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