Verses with the word ignorant in the Old Testament (3 verses):

Psalms 73:22
So foolish was I, and ignorant: I was as a beast before thee.

Isaiah 56:10
His watchmen are blind: they are all ignorant, they are all dumb dogs, they cannot bark; sleeping, lying down, loving to slumber.

Isaiah 63:16
Doubtless thou art our father, though Abraham be ignorant of us, and Israel acknowledge us not: thou, O LORD, art our father, our redeemer; thy name is from everlasting.