Which term refers to a belief that is not based on actual proof?

The term that refers to a belief not based on actual proof is faith. Faith is characterized by a strong belief or trust in something that may not be substantiated by empirical evidence or facts. It often relies on personal conviction, spirituality, or confidence in a system of beliefs, rather than on scientific demonstration or verification.

In contrast, truth typically refers to the state or quality of being in accordance with fact or reality, while data comprises quantitative or qualitative pieces of information that can provide support or evidence for claims. Bias refers to a systematic preference or inclination for or against something, which can affect judgment but does not directly relate to beliefs lacking proof. Thus, faith stands out as the most fitting choice for a belief grounded more in conviction than empirical credibility.