The word(s) "hidden" appears 34 time(s) in 33 verse(s) in Quran in Abdullah Yusuf Ali translation.

(21) Now no person knows what delights of the eye are kept hidden (in reserve) for them - as a reward for their (good) deeds.

(22) The Unbelievers say, "Never to us will come the Hour": Say, "Nay! but most surely, by my Lord, it will come upon you;- by Him Who knows the unseen,- from Whom is not hidden the least little atom in the heavens or on earth: Nor is there anything less than that, or greater, but is in the Record Perspicuous:

(23) Say: "Verily my Lord doth cast the (mantle of) Truth (over His servants),- He that has full knowledge of (all) that is hidden."

(24) Verily Allah knows (all) the hidden things of the heavens and the earth: verily He has full knowledge of all that is in (men's) hearts.

(25) And he said, "Truly do I love the love of good, with a view to the glory of my Lord,"- until (the sun) was hidden in the veil (of night):

(26) Say: "O Allah! Creator of the heavens and the earth! Knower of all that is hidden and open! it is Thou that wilt judge between Thy Servants in those matters about which they have differed."

(27) The Day whereon they will (all) come forth: not a single thing concerning them is hidden from Allah. Whose will be the dominion that Day?" That of Allah, the One the Irresistible!

(28) Those who pervert the Truth in Our Signs are not hidden from Us. Which is better?- he that is cast into the Fire, or he that comes safe through, on the Day of Judgment? Do what ye will: verily He seeth (clearly) all that ye do.

(29) Those who reject the Message when it comes to them (are not hidden from Us). And indeed it is a Book of exalted power.

(30) Those who avoid great sins and shameful deeds, only (falling into) small faults,- verily thy Lord is ample in forgiveness. He knows you well when He brings you out of the earth, And when ye are hidden in your mothers' wombs. Therefore justify not yourselves: He knows best who it is that guards against evil.