disbelieve

To not believe; to exercise disbelief.

If you disbelieve such people, then keep disbelieving them for as long as you live or want.

And the Lisbonites did not more disbelieve in, and dream less of their coming ruin, than Cecil did his, […]

To actively deny (a statement, opinion or perception).

He chose to disbelieve the bad news as inconceivable.

To cease to believe.

And so far as this opinion prevails, we have reason to fear that the important doctrine, of the real Divinity and even of the humanity of Christ, will be gradually disbelieved.

Elfrida walked slowly upstairs, reviewing what had happened and not happened in the last three, not to say six weeks, and gradually disbelieving the good case that she had made out.