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

(41) How much would those who disbelieved wish that they had been Muslims [those who have submitted themselves to Allah's Will in Islam i.e. Islamic Monotheism - this will be on the Day of Resurrection when they will see the disbelievers going to Hell and the Muslims going to Paradise].

(42) They would not believe in it (the Qur'an); and already the example of (Allah's punishment of) the ancients (who disbelieved) has gone forth.

(43) Who have made the Qur'an into parts. (i.e. believed in one part and disbelieved in the other). [Tafsir At-Tabari]

(44) In order that He may make manifest to them the truth of that wherein they differ, and that those who disbelieved (in Resurrection, and in the Oneness of Allah) may know that they were liars.

(45) And (remember) the Day when We shall raise up from each nation a witness (their Messenger), then, those who disbelieved will not be given leave (to put forward excuses), nor will they be allowed (to return to the world) to repent and ask for Allah's Forgiveness (of their sins).

(46) Those who disbelieved and hinder (men) from the Path of Allah, for them We will add torment to the torment because they used to spread corruption [by disobeying Allah themselves, as well as ordering others (mankind) to do so].

(47) Whoever disbelieved in Allah after his belief, except him who is forced thereto and whose heart is at rest with Faith; but such as open their breasts to disbelief, on them is wrath from Allah, and theirs will be a great torment.

(48) Do then those who disbelieved think that they can take My slaves [i.e., the angels, Allah's Messengers, 'Îsa (Jesus), son of Maryam (Mary)] as Auliya' (lords, gods, protectors) besides Me? Verily, We have prepared Hell as an entertainment for the disbelievers (in the Oneness of Allah - Islamic Monotheism) .

(49) "That shall be their recompense, Hell; because they disbelieved and took My Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) and My Messengers by way of jest and mockery.

(50) Have you seen him who disbelieved in Our Ayat (this Qur'an and Muhammad صلى الله عليه وسلم) and said: "I shall certainly be given wealth and children [if I will be alive (again)]."