|misbə̇|lēf, -spə̇- noun
Etymology: alteration of Middle English misbileve, misbileave, from mis- (I) + beleve, beleave belief — more at belief
1. : religious belief regarded as false or unorthodox : heresy
tried to convert him from his misbelief
2. : opinion or doctrine thought to be false
the misbeliefs and unscientific notions of prehistoric man