Kafir (plural Kuffar) All infidels, People of the Book (dhimmis), Mushrikun (idolators). Including extra-terrestrials from whatever outer planet (with the possible exception if from the moon). --And the Christians are Kuffars [infidels], and you may say to yourself, "No, no, no... They`re innocent!" No kuffar is innocent Mujahedeen Shuna Council.
Kafir Kafir signifies one who denies or rejects the truth, i.e. Who disbelieves in the message of the Prophets. Since the advent of Muhammad (S.A.W.), anyone who rejects his Message is a kafir.
Kafir Unbeliever