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

(11) "O our Lord! truly Thou dost know what we conceal and what we reveal: for nothing whatever is hidden from Allah, whether on earth or in heaven.

(12) If thou pronounce the word aloud, (it is no matter): for verily He knoweth what is secret and what is yet more hidden.

(13) "Verily the Hour is coming - My design is to keep it hidden - for every soul to receive its reward by the measure of its Endeavour.

(14) He knows what is hidden and what is open: too high is He for the partners they attribute to Him!

(15) And say to the believing women that they should lower their gaze and guard their modesty; that they should not display their beauty and ornaments except what (must ordinarily) appear thereof; that they should draw their veils over their bosoms and not display their beauty except to their husbands, their fathers, their husband's fathers, their sons, their husbands' sons, their brothers or their brothers' sons, or their sisters' sons, or their women, or the slaves whom their right hands possess, or male servants free of physical needs, or small children who have no sense of the shame of sex; and that they should not strike their feet in order to draw attention to their hidden ornaments. And O ye Believers! turn ye all together towards Allah, that ye may attain Bliss.

(16) "(Kept them away from the Path), that they should not worship Allah, Who brings to light what is hidden in the heavens and the earth, and knows what ye hide and what ye reveal.

(17) Say: None in the heavens or on earth, except Allah, knows what is hidden: nor can they perceive when they shall be raised up (for Judgment).

(18) "O my son!" (said Luqman), "If there be (but) the weight of a mustard-seed and it were (hidden) in a rock, or (anywhere) in the heavens or on earth, Allah will bring it forth: for Allah understands the finest mysteries, (and) is well-acquainted (with them).

(19) Such is He, the Knower of all things, hidden and open, the Exalted (in power), the Merciful;-

(20) And they say: "What! when we lie, hidden and lost, in the earth, shall we indeed be in a Creation renewed? Nay, they deny the Meeting with their Lord.