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

(251) Then, when he brought them the Truth from Us, they said: "Kill the sons of those who believe with him and let their women live"; but the plots of disbelievers are nothing but in vain!

(252) They will say: "Did there not come to you, your Messengers with (clear) evidence (and signs)?" They will say: "Yes." They will reply: "Then call (as you like)! And the invocation of the disbelievers is nothing but in vain (as it will not be answered by Allah)!"

(253) The Day when their excuses will be of no profit to Zalimun (polytheists, wrong-doers and disbelievers in the Oneness of Allah). Theirs will be the curse, and theirs will be the evil abode (i.e. painful torment in Hell-fire).

(254) "Besides Allah"? They will say: "They have vanished from us: Nay, we did not invoke (worship) anything before." Thus Allah leads astray the disbelievers.

(255) Then their Faith (in Islamic Monotheism) could not avail them when they saw Our punishment. (Like) this has been the way of Allah in dealing with His slaves. And there the disbelievers lost utterly (when Our Torment covered them).

(256) Say (O Muhammad صلى الله عليه وسلم): "I am only a human being like you. It is revealed to me that your Ilah (God) is One Ilah (God - Allah), therefore take Straight Path to Him (with true Faith - Islamic Monotheism) and obedience to Him, and seek forgiveness of Him. And woe to Al-Mushrikun (the polytheists, idolaters, disbelievers in the Oneness of Allah).

(257) Those who give not the Zakat and they are disbelievers in the Hereafter.

(258) Verily, those who turn away from Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc. by attacking, distorting and denying them) are not hidden from Us. Is he who is cast into the Fire better or he who comes secure on the Day of Resurrection? Do what you will. Verily He is All-Seer of what you do (this is a severe threat to the disbelievers ).

(259) Man (the disbeliever) does not get tired of asking good (things from Allah); but if an evil touches him, then he gives up all hope and is lost in despair.

(260) And truly, if We give him a taste of mercy from Us, after some adversity (severe poverty or disease, etc.) has touched him, he is sure to say: "This is due to my (merit); I think not that the Hour will be established. But if I am brought back to my Lord, surely, there will be for me the best (wealth) with Him. Then, We verily, will show to the disbelievers what they have done, and We shall make them taste a severe torment.