The word(s) "disbeliever" appears 377 time(s) in 355 verse(s) in Quran in Mohsin Khan translation.

(241) And they (Arab pagans) wonder that a warner (Prophet Muhammad صلى الله عليه وسلم) has come to them from among themselves. And the disbelievers say: "This (Prophet Muhammad صلى الله عليه وسلم) is a sorcerer, a liar.

(242) Shall We treat those who believe (in the Oneness of Allah - Islamic Monotheism) and do righteous good deeds as Mufsidun (those who associate partners in worship with Allah and commit crimes) on earth? Or shall We treat the Muttaqun (the pious - See V.2:2) as the Fujjar (criminals, disbelievers, the wicked)?

(243) This is so! And for the Taghun (transgressors, the disobedient to Allah and His Messenger - disbelievers in the Oneness of Allah, criminals) will be an evil final return (Fire).

(244) Except Iblis (Satan): he was proud and was one of the disbelievers.

(245) Surely the religion (i.e. the worship and the obedience) is for Allah only. And those who take Auliya' (protectors, helpers, lords, gods) besides Him (say): "We worship them only that they may bring us near to Allah." Verily Allah will judge between them concerning that wherein they differ. Truly, Allah guides not him who is a liar, and a disbeliever.

(246) Then, who does more wrong than one who utters a lie against Allah, and denies the truth [this Qur'an, the Prophet (Muhammad صلى الله عليه وسلم) and the Islamic Monotheism] when it comes to him! Is there not in Hell an abode for the disbelievers?

(247) And those who did wrong (the polytheists and disbelievers in the Oneness of Allah), if they had all that is in earth and therewith as much again, they verily, would offer it to ransom themselves therewith on the Day of Resurrection from the evil torment; and there will become apparent to them from Allah what they had not been reckoning.

(248) Yes! Verily, there came to you My Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) and you denied them, and were proud and were among the disbelievers.

(249) 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!"

(250) So, call you (O Muhammad صلى الله عليه وسلم and the believers) upon (or invoke) Allah making (your) worship pure for Him (Alone) (by worshipping none but Him and by doing religious deeds sincerely for Allah's sake only and not to show off and not to set up rivals with Him in worship), however much the disbelievers (in the Oneness of Allah) may hate (it).