The word(s) "certain" appears 498 time(s) in 437 verse(s) in Quran in Muhammad Habib Shakir translation.

(101) These towns-- We relate to you some of their stories, and certainly their apostles came to them with clear arguments, but they would not believe in what they rejected at first; thus does Allah set a seal over the hearts of the unbelievers

(102) And We did not find in most of them any (faithfulness to) covenant, and We found most of them to be certainly transgressors.

(103) He said: Yes, and you shall certainly be of those who are near (to me).

(104) I will certainly cut off your hands and your feet on opposite sides, then will I crucify you all together.

(105) And certainly We overtook Firon's people with droughts and diminution of fruits that they may be mindful.

(106) And when the plague fell upon them, they said: O Musa! pray for us to your Lord as He has promised with you, if you remove the plague from us, we will certainly believe in you and we will certainly send away with you the children of Israel.

(107) And when they repented and saw that they had gone astray, they said: If our Lord show not mercy to us and forgive us we shall certainly be of the losers.

(108) And when your Lord announced that He would certainly send against them to the day of resurrection those who would subject them to severe torment; most surely your Lord is quick to requite (evil) and most surely He is Forgiving, Merciful.

(109) And if We had pleased, We would certainly have exalted him thereby; but he clung to the earth and followed his low desire, so his parable is as the parable of the dog; if you attack him he lolls out his tongue; and if you leave him alone he lolls out his tongue; this is the parable of the people who reject Our communications; therefore relate the narrative that they may reflect.

(110) And certainly We have created for hell many of the jinn and the men; they have hearts with which they do not understand, and they have eyes with which they do not see, and they have ears with which they do not hear; they are as cattle, nay, they are in worse errors; these are the heedless ones.