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

(21) We know best of what they listen to, when they listen to you. And when they take secret counsel, then the Zalimun (polytheists and wrong-doers) say: "You follow none but a bewitched man."

(22) When he called out his Lord (Allah) a call in secret.

(23) And if you (O Muhammad صلى الله عليه وسلم) speak (the invocation) aloud, then verily, He knows the secret and that which is yet more hidden.

(24) Then they debated one with another what they must do, and they kept their talk secret.

(25) Say: "It (this Qur'an) has been sent down by Him (Allah) (the Real Lord of the heavens and earth) Who knows the secret of the heavens and the earth. Truly, He is Oft-Forgiving, Most Merciful."

(26) They said: "Swear one to another by Allah that we shall make a secret night attack on him and his household, and thereafter we will surely say to his near relatives: 'We witnessed not the destruction of his household, and verily we are telling the truth.'"

(27) And she said to his [Musa's (Moses)] sister: "Follow him." So she (his sister) watched him from a far place secretly, while they perceived not.

(28) Verily, those who recite the Book of Allah (this Qur'an), and perform As-Salat (Iqamat-as-Salat), and spend (in charity) out of what We have provided for them, secretly and openly, they hope for a (sure) trade-gain that will never perish.

(29) Or say they: "He has invented a lie against Allah?" If Allah willed, He could have sealed up your heart (so that you forget all that you know of the Qur'an). And Allah wipes out falsehood, and establishes the truth (Islam) by His Word (this Qur'an). Verily, He knows well what (secrets) are in the breasts (of mankind).

(30) Or do they think that We hear not their secrets and their private counsel? (Yes We do) and Our messengers (appointed angels in charge of mankind) are by them, to record.