Whereas Allah has described believers in the Qur'an with the best of names, He has found disbelievers, idolaters and hypocrites deserving of the most dishonorable ones since disbelievers are guilty. The offence they commit is the most serious offence ever. It is the most serious offence in the universe to be disobedient and ungrateful to Allah, Who created and gave one. Man is created to be a servant to Allah and will be repaid for it if he rejects his reason for existence. Allah debases that person both spiritually and physically to the most contemptible level. And that person is referred to with the basest names. Allah describes disbelievers in the Qur'an as follows:
But do not obey any vile swearer of oaths, any backbiter, slandermonger, impeder of good, evil aggressor, gross, coarse and furthermore, despicable, (Surat al-Qalam, 10-13)
... like panicked donkeys, fleeing from a lion? (Surat al-Muddaththir, 50-51)
Cursed be the Companions of the Pit. (Surat al-Buruj, 4)
We offered the Trust to the heavens, the earth and the mountains but they refused to take it on and shrank from it. But man took it on. He is indeed wrongdoing and ignorant. This was so that Allah might punish the men and women of the hypocrites, and the men and women of the idolaters, and turn towards the men and women of the believers. Allah is Ever-Forgiving, Most Merciful. (Surat al-Ahzab, 72-73)
The Companions of the Left: how wretched the Companions of the Left? (Surat al-Waqi'a, 9)
And the Companions of the Left: how wretched the Companions of the Left? (Surat al-Waqi'a, 41)
When the most unfortunate of them broke forth with, (Surat ash-Shams, 12)
And are begrudging towards you. Then when fear comes, you see them looking at you, their eyes rolling like people scared to death. But when fear departs they flay you with sharp tongues, grasping for wealth. Such people do not believe and Allah will make their actions come to nothing. That is easy for Allah. (Surat al-Ahzab, 19)
The ruling circle of those of his people who were arrogant said, 'We will drive you out of our city, Shu'ayb, you and those who believe along with you, unless you return to our religion.' He said, 'What, even though we detest it? (Surat al-A'raf, 88)
We have sent down the Book to you with the truth so that you can judge between people according to what Allah has shown to you. But do not be an advocate for the treacherous. (Surat an-Nisa', 105)
We did not find many of them worthy of their contract. We found most of them deviators. (Surat al-A'raf, 102)
They were defeated then and there, turned back belittled. (Surat al-A'raf, 119)
Whenever a good thing came to them, they said, 'This is our due.' But if anything bad happened to them, they would blame their ill fortune on Musa and those with him. No indeed! Their ill fortune will be with Allah. But most of them did not know. (Surat al-A'raf, 131) So We sent down on them floods, locusts, lice, frogs and blood, Signs, clear and distinct, but they proved arrogant and were an evildoing people. (Surat al-A'raf, 133)
I will turn away from My communications those who are unjustly proud in the earth; and if they see every sign they will not believe in It; and if they see the way of rectitude they do not take It for a way, and if they see the way of error they take it for a way; this is because they rejected Our communications and were heedless of them. (Surat al-A'raf, 146)
As for those who adopted the Calf, anger from their Lord will overtake them together with abasement in the life of this world. That is how we repay the purveyors of falsehood. (Surat al-A'raf, 152)
The People of the Book who are disbelievers and the idolaters will be in the Fire of Hell, remaining in it timelessly, for ever.They are the worst of creatures. (Surat al-Bayyina, 6)
When they were insolent about what they had been forbidden to do, We said to them, 'Be apes, despised, cast out!' (Surat al-A'raf, 166)
And We cut them up on the earth into parties, (some) of them being righteous and (others) of them falling short of that, and We tried them with blessings and misfortunes that they might turn. (Surat al-A'raf, 168)
Recite to them the tale of him to whom We gave Our Signs, but who then cast them to one side and Satan caught up with him. He was one of those lured into error. (Surat al-A'raf, 175)
We created many of the jinn and mankind for Hell. They have hearts they do not understand with. They have eyes they do not see with. They have ears they do not hear with. Such people are like cattle. No, they are even worse! They are the unaware. (Surat al-A'raf, 179)
This was so that He might verify the Truth and nullify the false, even though the evildoers hate that. (Surat al-Anfal, 8)
The worst of beasts in Allah's sight are the deaf and dumb who have no intellect. (Surat al-Anfal, 22)
Man is never tired of praying for good, and if evil touch him, then he is despairing, hopeless. (Surah Fussilat, 49)
You will see them as they are exposed to it, abject in their abasement, glancing around them furtively. Those who believe will say, 'Truly the losers are those who lose themselves and their families on the Day of Rising.'The wrongdoers are in an everlasting punishment. (Surat ash-Shura, 45)
Then you, you misguided, you deniers. (Surat al-Waqi'a, 51)
Satan has gained mastery over them and made them forget the remembrance of Allah. Such people are the party of Satan. No indeed! It is the party of Satan who are the losers. (Surat al-Mujadala, 19)
Did you not see the hypocrites saying to their brothers, those among the People of the Book who are disbelievers, 'If you are driven out we will leave with you, we will never obey anyone to your detriment. And if you are fought against we will help you'? Allah bears witness that they are truly liars. (Surat al-Hashr, 11)
No indeed! He is obdurate about Our Signs. (Surat al-Muddaththir, 16)
But the most miserable will shun it, (Surat al-A'la, 11)
No indeed! If he does not desist, We will grab him by the forelock, a lying, sinful forelock. (Surat al-Alaq, 15-16)
You who believe! The idolaters are unclean, so after this year they should not come near the Masjid al-Haram. If you fear impoverishment, Allah will enrich you from His bounty if He wills. Allah is All-Knowing, All-Wise. (Surat at-Tawba, 28)
But if We let him taste blessings after hardship has afflicted him, he says, 'My troubles have gone away,' and he is overjoyed, boastful. (Surah Hud, 10)
They asked for Allah's victory, and every obdurate tyrant failed. (Surah Ibrahim, 15)
We said to the angels, 'Prostrate to Adam!' and they prostrated, with the exception of Iblis. He refused and was arrogant and was one of the disbelievers. (Surat al-Baqara, 34)
The parable of those who reject Faith is as if one were to shout like a goat-herd, to things that listen to nothing but calls and cries: Deaf, dumb, and blind, they are void of wisdom. (Surat al-Baqara, 171)
Do you suppose that most of them hear or understand? They are just like cattle. Indeed they are even more astray! (Surat al-Furqan, 44)
He said, 'Get out of it, reviled and driven out. As for those of them who follow you, I will fill up Hell with every one of you.' (Surat al-A'raf, 18)
Those who were arrogant said, 'We reject Him in Whom you believe.' (Surat al-A'raf, 76)
'Hurl into Hell every obdurate disbeliever, impeder of good, doubt-causing aggressor. (Surah Qaf, 24-25)
Has the Reminder been given to him of all of us? No indeed! He is an impudent liar.' 'They will know tomorrow who the impudent liar is. (Surat al-Qamar, 25-26)
The dissolute will be in a Blazing Fire. (Surat al-Infitar, 14)
On the Day it comes, no self will speak except by His permission. Some of them will be wretched and others glad. (Surah Hud, 105)
Allah only did this for it to be good news for you and so that your hearts might be set at rest by it (help comes from no one but Allah, the Almighty, the All-Wise) and so that He might cut off a group of those who are disbelievers, or overwhelm them so that they retire, frustrated. (Surah Al 'Imran, 126-127)