The word(s) "disbelieved" appears 83 time(s) in 81 verse(s) in Quran in Mohsin Khan translation.

(21) And the Jews say: 'Uzair (Ezra) is the son of Allah, and the Christians say: Messiah is the son of Allah. That is their saying with their mouths, resembling the saying of those who disbelieved aforetime. Allah's Curse be on them, how they are deluded away from the truth!

(22) If you help him (Muhammad صلى الله عليه وسلم) not (it does not matter), for Allah did indeed help him when the disbelievers drove him out, the second of the two; when they (Muhammad صلى الله عليه وسلم and Abu Bakr رضي الله عنه) were in the cave, he (صلى الله عليه وسلم) said to his companion (Abu Bakr رضي الله عنه): "Be not sad (or afraid), surely Allah is with us." Then Allah sent down His Sakinah (calmness, tranquillity, peace) upon him, and strengthened him with forces (angels) which you saw not, and made the word of those who disbelieved the lowermost, while the Word of Allah that became the uppermost; and Allah is All-Mighty, All-Wise.

(23) And nothing prevents their contributions from being accepted from them except that they disbelieved in Allah and in His Messenger (Muhammad صلى الله عليه وسلم), and that they came not to As-Salat (the prayer) except in a lazy state, and that they offer not contributions but unwillingly.

(24) Make no excuse; you disbelieved after you had believed. If We pardon some of you, We will punish others amongst you because they were Mujrimun (disbelievers, polytheists, sinners, criminals.).

(25) They swear by Allah that they said nothing (bad), but really they said the word of disbelief, and they disbelieved after accepting Islam, and they resolved that (plot to murder Prophet Muhammad صلى الله عليه وسلم) which they were unable to carry out, and they could not find any cause to do so except that Allah and His Messenger had enriched them of His Bounty. If then they repent, it will be better for them, but if they turn away, Allah will punish them with a painful torment in this worldly life and in the Hereafter. And there is none for them on earth as a Wali (supporter, protector) or a helper.

(26) Whether you (O Muhammad صلى الله عليه وسلم) ask forgiveness for them (hypocrites) or ask not forgiveness for them - (and even) if you ask seventy times for their forgiveness - Allah will not forgive them because they have disbelieved in Allah and His Messenger (Muhammad صلى الله عليه وسلم). And Allah guides not those people who are Fasiqun (rebellious, disobedient to Allah).

(27) And never (O Muhammad صلى الله عليه وسلم) pray (funeral prayer) for any of them (hypocrites) who dies, nor stand at his grave. Certainly they disbelieved in Allah and His Messenger, and died while they were Fasiqun (rebellious, - disobedient to Allah and His Messenger صلى الله عليه وسلم).

(28) To Him is the return of all of you. The Promise of Allah is true. It is He Who begins the creation and then will repeat it, that He may reward with justice those who believed (in the Oneness of Allah - Islamic Monotheism) and did deeds of righteousness. But those who disbelieved will have a drink of boiling fluids and painful torment because they used to disbelieve.

(29) The chiefs who disbelieved among his people said: "We see you but a man like ourselves, nor do we see any follow you but the meanest among us and they (too) followed you without thinking. And we do not see in you any merit above us, in fact we think you are liars."

(30) And they were pursued by a curse in this world and (so they will be) on the Day of Resurrection. No doubt! Verily, 'Ad disbelieved in their Lord. So away with 'Ad, the people of Hud.