What is the meaning of the disbelief of denial, the disbelief of ignorance, and the disbelief of turning away?

Disbelief of ignorance is not believing due to ignorance, as substantiated by His (the Almighty’s) saying: "Rather, they disbelieved in that which they had not encompassed with their knowledge."

As for the disbelief of rejection, it is the concealment of truth despite knowing its veracity, as in His (the Almighty’s) saying about the Jews: "But when there came to them that which they recognized, they disbelieved in it."

And the disbelief of turning away is not caring about religion, or asking about it, or acting upon it, or learning it, and this expels one from the fold of Islam, as stated in His (the Almighty’s) saying: "But those who disbelieve are turning away from that about which they were warned."