misbelieving

Etymology 1
From.

Etymology 2
From, equivalent to.

Noun

 * 1) The refusal to believe something; disbelief, or an instance of this.
 * , II.12:
 * I know a man of authority, brought up in letters, who confessed unto me, that he was reclaimed from out the errours of mis-beleeving by the Arguments of Sebond.