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

(61) So We seized him and his hosts, and We threw them all into the sea (and drowned them). So behold (O Muhammad صلى الله عليه وسلم) what was the end of the Zalimun [wrong-doers, polytheists and those who disbelieved in the Oneness of their Lord (Allah), or rejected the advice of His Messenger Musa (Moses) عليه السلام].

(62) And as for those who disbelieved and belied Our Ayat (proofs, evidence, verses, lessons, signs, revelations, Allah's Messengers, Resurrection, etc.), and the Meeting of the Hereafter, such shall be brought forth to the torment (in the Hell-fire).

(63) And Allah drove back those who disbelieved in their rage: they gained no advantage (booty). Allah sufficed for the believers in the fighting (by sending against the disbelievers a severe wind and troops of angels). And Allah is Ever All-Strong, All-Mighty.

(64) Those who were deemed weak will say to those who were arrogant: "Nay, but it was your plotting by night and day: when you ordered us to disbelieve in Allah and set up rivals to Him!" And each of them (parties) will conceal their own regrets (for disobeying Allah during this worldly life), when they behold the torment. And We shall put iron collars round the necks of those who disbelieved. Are they requited aught except what they used to do?

(65) Then I took hold of those who disbelieved: and how terrible was My denial (punishment)!

(66) And those who disbelieved will be driven to Hell in groups till, when they reach it, the gates thereof will be opened (suddenly like a prison at the arrival of the prisoners). And its keepers will say, "Did not the Messengers come to you from yourselves, reciting to you the Verses of your Lord, and warning you of the Meeting of this Day of yours?" They will say: "Yes, but the Word of torment has been justified against the disbelievers!"

(67) Thus has the Word of your Lord been justified against those who disbelieved, that they will be the dwellers of the Fire.

(68) (It will be said): "This is because, when Allah Alone was invoked (in worship) you disbelieved (denied), but when partners were joined to Him, you believed! So the judgement is only with Allah, the Most High, the Most Great! "

(69) That was because there came to them their Messengers with clear evidence (proofs and signs) but they disbelieved (in them). So Allah seized them (with punishment). Verily He is All-Strong, Severe in punishment.

(70) Verily, those who disbelieved in the Reminder (i.e. the Qur'an) when it came to them (shall receive the punishment). And verily, it is an honourable well-fortified respected Book (because it is Allah's Speech, and He has protected it from corruption. (See V.15:9)