The word(s) "disbelief" appears 110 time(s) in 103 verse(s) in Quran in Mohsin Khan translation.

(41) And as for those who put up a mosque by way of harm and disbelief and to disunite the believers and as an outpost for those who warred against Allah and His Messenger (Muhammad صلى الله عليه وسلم) aforetime, they will indeed swear that their intention is nothing but good. Allah bears witness that they are certainly liars.

(42) (The believers whose lives Allah has purchased are) those who turn to Allah in repentance (from polytheism and hypocrisy, etc.), who worship (Him), who praise (Him), who fast (or go out in Allah's Cause), who bow down (in prayer), who prostrate themselves (in prayer), who enjoin (on people) Al-Ma'ruf (i.e. Islamic Monotheism and all what Islam has ordained) and forbid (people) from Al-Munkar (i.e. disbelief, polytheism of all kinds and all that Islam has forbidden), and who observe the limits set by Allah (do all that Allah has ordained and abstain from all kinds of sins and evil deeds which Allah has forbidden). And give glad tidings to the believers.

(43) It is not (proper) for the Prophet and those who believe to ask Allah's Forgiveness for the Mushrikun (polytheists, idolaters, pagans, disbelievers in the Oneness of Allah), even though they be of kin, after it has become clear to them that they are the dwellers of the Fire (because they died in a state of disbelief).

(44) But as for those in whose hearts is a disease (of doubt, disbelief and hypocrisy), it will add suspicion and doubt to their suspicion, disbelief and doubt; and they die while they are disbelievers.

(45) If only there had been among the generations before you persons having wisdom, prohibiting (others) from Al-Fasad (disbelief, polytheism, and all kinds of crimes and sins) in the earth, (but there were none) - except a few of those whom We saved from among them! Those who did wrong pursued the enjoyment of good things of (this worldly) life, and were Mujrimun (criminals, disbelievers in Allah, polytheists, sinners).

(46) He sends down water (rain) from the sky, and the valleys flow according to their measure, but the flood bears away the foam that mounts up to the surface - and (also) from that (ore) which they heat in the fire in order to make ornaments or utensils, rises a foam like unto it, thus does Allah (by parables) show forth truth and falsehood . Then, as for the foam it passes away as scum upon the banks, while that which is for the good of mankind remains in the earth. Thus Allah sets forth parables (for the truth and falsehood, i.e. Belief and disbelief).

(47) Alif-Lam-Ra. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings]. (This is) a Book which We have revealed unto you (O Muhammad صلى الله عليه و سلم) in order that you might lead mankind out of darkness (of disbelief and polytheism) into light (of belief in the Oneness of Allah and Islamic Monotheism) by their Lord's Leave to the Path of the All-Mighty, the Owner of all Praise.

(48) Have you not seen those who have changed the Blessings of Allah into disbelief (by denying Prophet Muhammad صلى الله عليه و سلم and his Message of Islam), and caused their people to dwell in the house of destruction?

(49) And He gave you of all that you asked for, and if you count the Blessings of Allah, never will you be able to count them. Verily, man is indeed an extreme wrong-doer, a disbeliever (an extreme ingrate who denies Allah's Blessings by disbelief, and by worshipping others besides Allah, and by disobeying Allah and His Prophet Muhammad صلى الله عليه و سلم).

(50) Thus do We let it (polytheism and disbelief) enter the hearts of the Mujrimun [criminals, polytheists and pagans (because of their mocking at the Messengers)].