The word(s) "doubt" appears 53 time(s) in 51 verse(s) in Quran in Muhammad Habib Shakir translation.

(21) No doubt that in the hereafter they will be the losers.

(22) Do they not consider that Allah, Who created the heavens and the earth, is able to create their like, and He has appointed for them a doom about which there is no doubt? But the unjust do not consent to aught but denying.

(23) And thus did We make (men) to get knowledge of them that they might know that Allah's promise is true and that as for the hour there is no doubt about it. When they disputed among themselves about their affair and said: Erect an edifice over them-- their Lord best knows them. Those who prevailed in their affair said: We will certainly raise a masjid over them.

(24) O people! if you are in doubt about the raising, then surely We created you from dust, then from a small seed, then from a clot, then from a lump of flesh, complete in make and incomplete, that We may make clear to you; and We cause what We please to stay in the wombs till an appointed time, then We bring you forth as babies, then that you may attain your maturity; and of you is he who is caused to die, and of you is he who is brought back to the worst part of life, so that after having knowledge he does not know anything; and you see the earth sterile land, but when We send down on it the water, it stirs and swells and brings forth of every kind a beautiful herbage.

(25) And because the hour is coming, there is no doubt about it; and because Allah shall raise up those who are in the graves.

(26) And those who disbelieve shall not cease to be in doubt concerning it until the hour overtakes them suddenly, or there comes on them the chastisement of a destructive day.

(27) Is there in their hearts a disease, or are they in doubt, or do they fear that Allah and His Apostle will act wrongfully towards them? Nay! they themselves are the unjust.

(28) Nay, their knowledge respecting the hereafter is slight and hasty; nay, they are in doubt about it; nay, they are quite blind to it

(29) And you did not recite before it any book, nor did you transcribe one with your right hand, for then could those who say untrue things have doubted.

(30) The revelation of the Book, there is no doubt in it, is from the Lord of the worlds.