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

(51) And (all) faces shall be humbled before (Allah), Al-Hayyul-Qayyum (the Ever Living, the One Who sustains and protects all that exists). And he who carried (a burden of) wrongdoing (i.e. he who disbelieved in Allah, ascribed partners to Him, and did deeds of His disobedience), will be indeed a complete failure (on that Day).

(52) And when those who disbelieved (in the Oneness of Allah) see you (O Muhammad صلى الله عليه وسلم), they take you not except for mockery (saying): "Is this the one who talks (badly) about your gods?" While they disbelieve at the mention of the Most Gracious (Allah). [Tafsir Al-Qurtubi].

(53) If only those who disbelieved knew (the time) when they will not be able to ward off the Fire from their faces, nor from their backs, and they will not be helped.

(54) These two opponents (believers and disbelievers) dispute with each other about their Lord: then as for those who disbelieved, garments of fire will be cut out for them, boiling water will be poured down over their heads.

(55) Verily, those who disbelieved and hinder (men) from the Path of Allah, and from Al-Masjid-al-Haram (at Makkah) which We have made (open) to (all) men, the dweller in it and the visitor from the country are equal there [as regards its sanctity and pilgrimage (Hajj and 'Umrah)] - and whoever inclines to evil actions therein or to do wrong (i.e. practise polytheism and leave Islamic Monotheism), him We shall cause to taste from a painful torment.

(56) And those who disbelieved will not cease to be in doubt about it (this Qur'an) until the Hour comes suddenly upon them, or there comes to them the torment of the Day after which there will be no night (i.e. the Day of Resurrection).

(57) And those who disbelieved and belied Our Verses (of this Qur'an), for them will be a humiliating torment (in Hell).

(58) And when Our Clear Verses are recited to them, you will notice a denial on the faces of the disbelievers! They are nearly ready to attack with violence those who recite Our Verses to them. Say: "Shall I tell you of something worse than that? The Fire (of Hell) which Allah has promised to those who disbelieved, and worst indeed is that destination!"

(59) But the chiefs of his people who disbelieved said: "He is no more than a human being like you, he seeks to make himself superior to you. Had Allah willed, He surely could have sent down angels. Never did we hear such a thing among our fathers of old.

(60) And the chiefs of his people who disbelieved and denied the Meeting in the Hereafter, and whom We had given the luxuries and comforts of this life, said: "He is no more than a human being like you, he eats of that which you eat, and drinks of what you drink.