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

(141) And certainly We sent Musa with Our communications and a clear authority,

(142) And certainly We gave the book to Musa, but it was gone against; and had not a word gone forth from your Lord, the matter would surely have been decided between them; and surely they are in a disquieting doubt about it.

(143) And if your Lord had pleased He would certainly have made people a single nation, and they shall continue to differ.

(144) Except those on whom your Lord has mercy; and for this did He create them; and the word of your Lord is fulfilled: certainly I will fill hell with the jinn and the men, all together.

(145) We narrate to you the best of narratives, by Our revealing to you this Quran, though before this you were certainly one of those who did not know.

(146) certainly in Yusuf and his brothers there are signs for the inquirers.

(147) When they said: certainly Yusuf and his brother are dearer to our father than we, though we are a (stronger) company; most surely our father is in manifest error:

(148) They said: Surely if the wolf should devour him notwithstanding that we are a (strong) company, we should then certainly be losers.

(149) So when they had gone off with him and agreed that they should put him down at the bottom of the pit, and We revealed to him: You will most certainly inform them of this their affair while they do not perceive.

(150) And certainly she made for him, and he would have made for her, were it not that he had seen the manifest evidence of his Lord; thus (it was) that We might turn away from him evil and indecency, surely he was one of Our sincere servants.