Physicist: Determinism is the view that every event has a preceding cause sufficient for its occurrence  That is, if determinism is true, then the events that are presently occurring could not have failed to occur given the state of the universe a moment ago
Determinism, however, is false because it is impossible to know the complete state of the universe at any given time since it is impossible to measure accurately both the position and velocity of any given subatomic particle at a particular time
That it is impossible to know the complete state of the universe at any given time does not imply that there is no complete state of the universe at that time.