'Unbelief' in the Bible

and at the promise of God did not stagger in unbelief, but was strengthened in faith, having given glory to God,

by unbelief they were broken off, and thou hast stood by faith; be not high-minded, but be fearing;

And those also, if they may not remain in unbelief, shall be graffed in, for God is able again to graff them in;

for as ye also once did not believe in God, and now did find kindness by the unbelief of these:

for God did shut up together the whole to unbelief, that to the whole He might do kindness.