The word(s) "secret" appears 47 time(s) in 46 verse(s) in Quran in Muhammad Habib Shakir translation.

(11) Call on your Lord humbly and secretly; surely He does not love those who exceed the limits.

(12) Firon said: Do you believe in Him before I have given you permission? Surely this is a plot which you have secretly devised in this city, that you may turn out of it its people, but you shall know:

(13) Do they not know that Allah knows their hidden thoughts and their secret counsels, and that Allah is the great Knower of the unseen things?

(14) This is that he might know that I have not been unfaithful to him in secret and that Allah does not guide the device of the unfaithful.

(15) They said: If he steal, a brother of his did indeed steal before; but Yusuf kept it secret in his heart and did not disclose it to them. He said: You are in an evil condition and Allah knows best what you state.

(16) And those who are constant, seeking the pleasure of their Lord, and keep up prayer and spend (benevolently) out of what We have given them secretly and openly and repel evil with good; as for those, they shall have the (happy) issue of the abode

(17) Say to My servants who believe that they should keep up prayer and spend out of what We have given them secretly and openly before the coming of the day in which there shall be no bartering nor mutual befriending.

(18) Allah sets forth a parable: (consider) a slave, the property of another, (who) has no power over anything, and one whom We have granted from Ourselves a goodly sustenance so he spends from it secretly and openly; are the two alike? (All) praise is due to Allah! Nay, most of them do not know.

(19) We know best what they listen to when they listen to you, and when they take counsel secretly, when the unjust say: You follow only a man deprived of reason.

(20) And if you utter the saying aloud, then surely He knows the secret, and what is yet more hidden.