Disbelieve (verb)

1. Refuse to accept the truth or existence of.
2. Refuse to accept (something) as true or valid.

Origin:

Late 16th century: from dis- "not" + believe.

Examples:

1. He refused to disbelieve the evidence that was presented to him.
2. Many people disbelieve the story that he tells.
3. She was disbelief when she heard the news.
4. He was disbelief that he had won the lottery.
5. The public"s disbelief in the government"s story is growing.