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

(31) Then he turned aside to their gods secretly and said: What! do you not eat?

(32) Then he turned against them secretly, smiting them with the right hand.

(33) Or do they think that We do not hear what they conceal and their secret discourses? Aye! and Our apostles with them write down.

(34) That is because they say to those who hate what Allah has revealed: We will obey you in some of the affairs; and Allah knows their secrets.

(35) Who fears the Beneficent Allah in secret and comes with a penitent heart:

(36) Then he turned aside to his family secretly and brought a fat (roasted) calf,

(37) Certainly We sent Our apostles with clear arguments, and sent down with them the Book and the balance that men may conduct themselves with equity; and We have made the iron, wherein is great violence and advantages to men, and that Allah may know who helps Him and His apostles in the secret; surely Allah is Strong, Mighty.

(38) Do you not see that Allah knows whatever is in the heavens and whatever is in the earth? Nowhere is there a secret counsel between three persons but He is the fourth of them, nor (between) five but He is the sixth of them, nor less than that nor more but He is with them wheresoever they are; then He will inform them of what they did on the day of resurrection: surely Allah is Cognizant of all things.

(39) Have you not seen those who are forbidden secret counsels, then they return to what they are forbidden, and they hold secret counsels for sin and revolt and disobedience to the Apostle, and when they come to you they greet you with a greeting with which Allah does not greet you, and they say in themselves: Why does not Allah punish us for what we say? Hell is enough for them; they shall enter it, and evil is the resort.

(40) secret counsels are only (the work) of the Shaitan that he may cause to grieve those who believe, and he cannot hurt them in the least except with Allah's permission, and on Allah let the believers rely.