The word(s) "sinful" appears 11 time(s) in 11 verse(s) in Quran in Saheeh International translation.

(1) And if you are on a journey and cannot find a scribe, then a security deposit [should be] taken. And if one of you entrusts another, then let him who is entrusted discharge his trust [faithfully] and let him fear Allah, his Lord. And do not conceal testimony, for whoever conceals it - his heart is indeed sinful, and Allah is Knowing of what you do.

(2) And do not argue on behalf of those who deceive themselves. Indeed, Allah loves not one who is a habitually sinful deceiver.

(3) And I will mislead them, and I will arouse in them [sinful] desires, and I will command them so they will slit the ears of cattle, and I will command them so they will change the creation of Allah." And whoever takes Satan as an ally instead of Allah has certainly sustained a clear loss.

(4) Why do the rabbis and religious scholars not forbid them from saying what is sinful and devouring what is unlawful? How wretched is what they have been practicing.

(5) O you who have believed, testimony [should be taken] among you when death approaches one of you at the time of bequest - [that of] two just men from among you or two others from outside if you are traveling through the land and the disaster of death should strike you. Detain them after the prayer and let them both swear by Allah if you doubt [their testimony, saying], "We will not exchange our oath for a price, even if he should be a near relative, and we will not withhold the testimony of Allah. Indeed, we would then be of the sinful."

(6) Joseph, ignore this. And, [my wife], ask forgiveness for your sin. Indeed, you were of the sinful."

(7) They descend upon every sinful liar.

(8) Is food for the sinful.

(9) Woe to every sinful liar

(10) A preventer of good, transgressing and sinful,