The word(s) "unbeliever" appears 179 time(s) in 160 verse(s) in Quran in Abdullah Yusuf Ali translation.

(151) The unbelievers, the which there is none to ward off,-

(152) Now what is the matter with the unbelievers that they rush madly before thee-

(153) And Noah, said: "O my Lord! Leave not of the unbelievers, a single one on earth!

(154) And We have set none but angels as Guardians of the Fire; and We have fixed their number only as a trial for unbelievers,- in order that the People of the Book may arrive at certainty, and the Believers may increase in Faith,- and that no doubts may be left for the People of the Book and the Believers, and that those in whose hearts is a disease and the unbelievers may say, "What symbol doth Allah intend by this?" Thus doth Allah leave to stray whom He pleaseth, and guide whom He pleaseth: and none can know the forces of thy Lord, except He and this is no other than a warning to mankind.

(155) Verily, We have warned you of a Penalty near, the Day when man will see (the deeds) which his hands have sent forth, and the unbeliever will say, "Woe unto me! Would that I were (metre) dust!"

(156) But on this Day the Believers will laugh at the unbelievers:

(157) Will not the unbelievers have been paid back for what they did?

(158) But on the contrary the unbelievers reject (it).

(159) And yet the unbelievers (persist) in rejecting (the Truth)!

(160) Therefore grant a delay to the unbelievers: Give respite to them gently (for awhile).