The word(s) "secret" appears 43 time(s) in 42 verse(s) in Quran in Mohsin Khan translation.

(31) This is because they said to those who hate what Allah has sent down: "We will obey you in part of the matter." But Allah knows their secrets.

(32) If He were to ask you of it, and press you, you would covetously withhold, and He will bring out all your (secret) ill-wills.

(33) Have you not seen that Allah knows whatsoever is in the heavens and whatsoever is on the earth? There is no Najwa (secret counsel) of three but He is their fourth (with His Knowledge, while He Himself is over the Throne, over the seventh heaven), nor of five but He is their sixth (with His Knowledge), nor of less than that or more but He is with them (with His Knowledge) wheresoever they may be. And afterwards on the Day of Resurrection He will inform them of what they did. Verily, Allah is the All-Knower of everything.

(34) Have you not seen those who were forbidden to hold secret counsels, and afterwards returned to that which they had been forbidden, and conspired together for sin and wrong doing and disobedience to the Messenger (Muhammad صلى الله عليه وسلم). And when they come to you, they greet you with a greeting wherewith Allah greets you not, and say within themselves: "Why should Allah punish us not for what we say?" Hell will be sufficient for them; they will burn therein. And worst indeed is that destination!

(35) O you who believe! When you hold secret counsel, do it not for sin and wrong-doing, and disobedience towards the Messenger (Muhammad صلى الله عليه وسلم), but do it for Al-Birr (righteousness) and Taqwa (virtues and piety); and fear Allah unto Whom you shall be gathered.

(36) secret counsels (conspiracies) are only from Shaitan (Satan), in order that he may cause grief to the believers. But he cannot harm them in the least, except as Allah permits. And in Allah let the believers put their trust .

(37) O you who believe! Take not My enemies and your enemies (i.e. disbelievers and polytheists) as friends, showing affection towards them, while they have disbelieved in what has come to you of the truth (i.e. Islamic Monotheism, this Qur'an, and Muhammad صلى الله عليه وسلم), and have driven out the Messenger (Muhammad صلى الله عليه وسلم) and yourselves (from your homeland) because you believe in Allah your Lord! If you have come forth to strive in My Cause and to seek My Good Pleasure, (then take not these disbelievers and polytheists as your friends). You show friendship to them in secret, while I am All-Aware of what you conceal and what you reveal. And whosoever of you (Muslims) does that, then indeed he has gone (far) astray from the Straight Path .

(38) And whether you keep your talk secret or disclose it, Verily, He is the All-Knower of what is in the breasts (of men).

(39) So they departed, conversing in secret low tones (saying):

(40) That Day shall you be brought to Judgement, not a secret of you will be hidden.