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

(91) And instead (of thanking Allah) for the provision He gives you, you deny (Him by disbelief)!

(92) He it is Who sent among the unlettered ones a Messenger (Muhammad صلى الله عليه وسلم) from among themselves, reciting to them His Verses, purifying them (from the filth of disbelief and polytheism), and teaching them the Book (this Qur'an, Islamic laws and Islamic jurisprudence) and Al-Hikmah (As-Sunnah: legal ways, orders, acts of worship of Prophet Muhammad صلى الله عليه وسلم). And verily, they had been before in manifest error;

(93) Has not the news reached you of those who disbelieved aforetime? And so they tasted the evil result of their disbelief, and theirs will be a painful torment.

(94) So it tasted the evil result of its affair (disbelief), and the consequence of its affair (disbelief) was loss (destruction in this life and an eternal punishment in the Hereafter).

(95) (And has also sent to you) a Messenger (Muhammad صلى الله عليه وسلم), who recites to you the Verses of Allah (the Qur'an) containing clear explanations, that He may take out those who believe and do righteous good deeds, from the darkness (of polytheism and disbelief) to the light (of Islamic Monotheism). And whosoever believes in Allah and performs righteous good deeds, He will admit him into Gardens under which rivers flow (Paradise) to dwell therein forever. Allah has indeed granted for him an excellent provision.

(96) Go to Fir'aun (Pharaoh); verily he has transgressed all bounds (in crimes, sins, polytheism, disbelief).

(97) And say to him: "Would you purify yourself (from the sin of disbelief by becoming a believer)?"

(98) Then for him who transgressed all bounds, (in disbelief, oppression and evil deeds of disobedience to Allah).

(99) What does it matter to you if he will not become pure (from disbelief: you are only a Messenger, your duty is to convey the Message of Allah).

(100) And none can deny it except every transgressor beyond bounds, (in disbelief, oppression and disobedience to Allah) the sinner!