Can I say that a phenominon(e.g. like a coin flip) Is not deterministic but also not 50/50 ,rather completly unpredictable ? Is there a term for such behaviour ? Is that what "random" mean or is random apply for 50/50 ?
Determinism typically means (something like) being predictable in principle, if given adequate information and computational power. If I understand what you mean by these terms, then I would say that a coin flip is both deterministic but also unpredictable due to the fact that we do not in fact have the adequate information and/or computational power necessary to make a prediction within acceptable measurement error.