The word(s) "disbelieved" appears 58 time(s) in 56 verse(s) in Quran in Muhammad Habib Shakir translation.

(51) So today ransom shall not be accepted from you nor from those who disbelieved; your abode is the fire; it is your friend and evil is the resort.

(52) He it is Who caused those who disbelieved of the followers of the Book to go forth from their homes at the first banishment you did not think that they would go forth, while they were certain that their fortresses would defend them against Allah; but Allah came to them whence they did not expect, and cast terror into their hearts; they demolished their houses with their own hands and the hands of the believers; therefore take a lesson, O you who have eyes!

(53) O you who believe! be helpers (in the cause) of Allah, as~ Isa son of Marium said to (his) disciples: Who are my helpers in the cause of Allah? The disciples said: We are helpers (in the cause) of Allah. So a party of the children of Israel believed and another party disbelieved; then We aided those who believed against their enemy, and they became uppermost.

(54) Has there not come to you the story of those who disbelieved before, then tasted the evil result of their conduct, and they had a painful punishment?

(55) That is because there came to them their apostles with clear arguments, but they said: Shall mortals guide us? So they disbelieved and turned back, and Allah does not stand in need (of anything), and Allah is Self-sufficient, Praised.

(56) Those who disbelieved from among the followers of the Book and the polytheists could not have separated (from the faithful) until there had come to them the clear evidence: