'In common parlance, randomness is the apparent lack of pattern or predictability in events' [1].
It doesn't mean there is no cause, but we can't predict the outcome of the random process [2].
In some case we can't predict it because we don't understand it, in others it is inherently unpredictable according to our model of the world.
As for radioactive decay, specifically: 'According to quantum theory, it is impossible to predict when a particular atom will decay, regardless of how long the atom has existed'[3].
That only means quantum theory can't predict it, it doesn't mean other theory won't be able to.
It's just we're stuck with quantum theory for now, because it has been verified by all experiments done so far, and not yet disproven by new experiments.
Every theory has a lifetime as long as it is not proven wrong by experiment. And cause and predictive capability are directly tied to particular theory/model you're using.
so 'random' might mean:
1) we have a good coherent model, consistent with empirical results, and a particular process/phenomenon is unpredictable according to our model.
or alternatively
2) we don't have a good model/don't understand the cause and therefore can't predict the outcome a particular process/phenomenon
both 1 and 2 leave space for a new theory to come in, and be able to explain the cause/make the prediction and eliminate 'randomness'
so essentially you're right.
[1] https://en.wikipedia.org/wiki/Randomness
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