Apredicts overall natural events in general terms, while a is a is a very specific prediction based on one circumstance.

A theory predicts overall events, while a hypothesis is specific.

A scientific hypothesis is a statement that predicts the outcome(s) of an experiment. It is specific for that experiment and its correctness is tested.
Meanwhile, a scientific theory is a statement formed from numerous testing. The theory explains the natural event(s) in the best possible manner and holds true until it is discredited by an experiment which yields results opposing the theory's prediction.

Hold on to his or her beliefs even if there is no evidence for those beliefs.