'Unbelief' in the Bible

He was amazed at their unbelief. Then he went around to the villages and continued teaching.

With tears flowing, the child's father at once cried out, "I do believe! Help my unbelief!"

Finally he appeared to his eleven disciples while they were eating. He rebuked them for their unbelief and stubbornness, because they had not believed those who had seen him after he had risen.