The word(s) "unbeliever" appears 125 time(s) in 122 verse(s) in Quran in Muhammad Habib Shakir translation.

(91) He has made plain to you of the religion what He enjoined upon Nuh and that which We have revealed to you and that which We enjoined upon Ibrahim and Musa and Isa that keep to obedience and be not divided therein; hard to the unbelievers is that which you call them to; Allah chooses for Himself whom He pleases, and guides to Himself him who turns (to Him), frequently.

(92) And He answers those who believe and do good deeds, and gives them more out of His grace; and (as for) the unbelievers, they shall have a severe punishment.

(93) (The warner) said: What! even if I bring to you a better guide than that on which you found your fathers? They said: Surely we are unbelievers in that with which you are sent.

(94) Have they not then journeyed in the land and seen how was the end of those before them: Allah brought down destruction upon them, and the unbelievers shall have the like of it.

(95) That is because Allah is the Protector of those who believe, and because the unbelievers shall have no protector for them.

(96) Surely those who disbelieve and turn away from Allah's way, then they die while they are unbelievers, Allah will by no means forgive them.

(97) And whoever does not believe in Allah and His Apostle, then surely We have prepared burning fire for the unbelievers.

(98) Muhammad is the Apostle of Allah, and those with him are firm of heart against the unbelievers, compassionate among themselves; you will see them bowing down, prostrating themselves, seeking grace from Allah and pleasure; their marks are in their faces because of the effect of prostration; that is their description in the Taurat and their description in the Injeel; like as seed-produce that puts forth its sprout, then strengthens it, so it becomes stout and stands firmly on its stem, delighting the sowers that He may enrage the unbelievers on account of them; Allah has promised those among them who believe and do good, forgiveness and a great reward.

(99) Nay! they wonder that there has come to them a warner from among themselves, so the unbelievers say: This is a wonderful thing:

(100) Hastening to the inviter. The unbelievers shall say: This is a hard day.