'Unbelief' in the Bible

And he did not perform many miracles in that place because of their unbelief.

And he was astonished because of their unbelief.

Immediately the father of the child cried out [and] said, "I believe! Help my unbelief!"

And later, [while] they were reclining at table, he appeared to the eleven. And he reprimanded their unbelief and hardness of heart, because they did not believe those who had seen him [after he] had been raised.

{What is the result} if some refused to believe? Their unbelief will not nullify the faithfulness of God, [will it]?

And he did not waver in unbelief at the promise of God, but was strengthened in faith, giving glory to God

Well said! They were broken off because of unbelief, but you stand firm because of faith. Do not think arrogant [thoughts], but be afraid.

And those also, if they do not persist in unbelief, will be grafted in, because God is able to graft them in again.

[although I] was formerly a blasphemer and a persecutor and a violent man, but I was shown mercy because I acted ignorantly in unbelief,

And [so] we see that they were not able to enter because of unbelief.