Verses with the word stiffnecked in the Apocrypha (2 verses):

Sirach 16:11
And if there be one stiffnecked among the people, it is marvel if he escape unpunished: for mercy and wrath are with him; he is mighty to forgive, and to pour out displeasure.

Baruch 2:30
For I knew that they would not hear me, because it is a stiffnecked people: but in the land of their captivities they shall remember themselves.