The following information was excerpted from the appendices to the English translation of TAFSEER IBN KATHEER.The Qur’aan uses the word Kufr to denote people who cover up or hide realities. The Qur’aan uses this word to identify those who denied Allaah’s favors by not accepting His Dominion and Authority. Kufr thus is an antonym for Iman or disbelief in Allaah and a Kaafir is a non-believer. This type of Kufr is called AL-KUFR UL AKBAR or major kufr. There are many types of Al-Kufr ul Akbar:
1. Kufrul-’Inaad: Disbelief out of stubborness. This applies to someone who knows the truth and admits to knowing the truth and admits to knowing it with his tongue, but refuses to accept it and refrains from making a declaration. Allaah سبحانه و تعالى says: Throw into Hell every stubborn disbeliever [Soorah Qaaf (50), Ayah 24]
2. Kufrul-Inkaar: Disbelief out of denial. This applies to someone who denies with both heart and tongue. Allaah سبحانه و تعالى says: They recognize the favors of Allaah, yet they deny them. Most of them are disbelievers. [Soorah Nahl (16), Ayah 83]
3. Kufrul-Kibr: Disbelief out of arrogance and pride. The disbelief by the devils (Iblees) is an example of this type of Kufr.
4. Kufrul-Juhood: Disbelief out of rejection.This applies to someone who aknowledges the truth in his heart, but rejects it with his tongue. This types of kufr is applicable to those who calls themselves Muslims but who reject any necessary and accepted norms of Islam such as Salaat and Zakat. Allaah سبحانه و تعالى says: They denied them (OUR SIGNS) even though their hearts believed in them , out of spite and arrogance. [Soorah Naml (27), Ayah 14]
5. Kufrul-Nifaaq: Disbelief out of hypocrisy.This applies to someone who pretends to be a believer but conceals his disbelief. Such a person is called a MUNAFIQ or hypocrite. Allaah سبحانه و تعالى says: Verily the hypocrites will be in the lowest depths of Hell. You will find no one to help them. [Soorah An Nisaa (4), Ayah 145]
6. Kufrul-Istihaal: Disbelief out of trying to make HARAM into HALAL. This applies to someone who accepts as lawful (Halal) that which Allaah has made unlawful (Haram) like alcohol or adultery.Only Allaah سبحانه و تعالى has the prerogative to make things Halal and Haram and those who seek to interfere with His right are like rivals to Him and therefore fall outside the boundries of faith.
7. Kufrul-Kurh: Disbelief out of detesting any of Allaah’s سبحانه و تعالى commands. Allaah سبحانه و تعالى says: Perdition (destruction) has been consigned to those who disbelieve and He will render their actions void. This is because they are averse to that which Allaah has revealed so He has made their actions fruitless. [Soorah Muhammed (47), Ayah 8-9]
8. Kufrul-Istihzaha: Disbelief due to mockery and derision. Allaah سبحانه و تعالى says: Say: Was it at Allaah, His signs and His apostles that you were mocking? Make no excuses. You have disbelieved after you have believed. [Soorah Taubah (9), ayah 65-66]
9. Kufrul-I’raadh: Disbelief due to avoidance. This applies to those who turn away and avoid the truth. Allaah سبحانه و تعالى says: And who is more unjust than he who is reminded of his Lord’s signs but then turns away from them. Then he forgets what he has sent forward (for the Day of Judgement) [Soorah Kahf (18), Ayah 57]
10. Kufrul-Istibdaal: Disbelief because of trying to substitute Allaah’s Laws. This could take the form of:
(a) Rejection of Allaah’s law (Sharee’ah) without denying it
(b) Denial of Allaah’s law and therefore rejecting it, or
(c) Substituting Allaah’s laws with man-made laws. Allaah سبحانه و تعالى says: Or have they partners with Allaah who have instituted for them a religion which Allaah has not allowed. [Soorah Shuraa(42), Ayah 8] Allaah سبحانه و تعالى says: Say not concerning that which your tongues put forth falsely (that) is lawful and this is forbidden so as to invent a lie against Allaah. Verily, those who invent a lie against Allaah will never prosper. [Soorah Nahl (16), Ayah 116]